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Email addresses are never displayed, but they are required to confirm your comments. To state your solve time use the smaller form at the top right of this page." & vbNewLine & _ Line breaks and paragraphs are automatically converted ? no need to use <p> or <br> tags.

Tuesday 16-Jul-2019

... by: jpf Naperville

puzzle 85

Monday 15-Jul-2019

... by: SuDokuFan

@BobW
Take the unsolvable URL and add this to the back:
?puz=(puzzle no.) to get any old unsolvable

Monday 15-Jul-2019

... by: BobW

@Algo, Thanks for the list. That will keep me busy for a while.

@SuDokuFan, Thanks for the WU list. Is there an archive of the older WU's somewhere? The Archive popup menu on this page shows only the most recent 40 puzzles.

Monday 15-Jul-2019

... by: SuDokuFan

@Algo, have you figured out the implementation in your solver yet? Hint, what you're appearing to be missing is the Swordfish structure in the S-Cells, as described in my final post on wu354

Monday 15-Jul-2019

... by: Algo

@BobW,

I found many puzzles valid Exocet and double Exocet for your testing. I have confirmed them with the Solver.

Sorry for dumping these puzzles here. These will be the last.

..9.....8.7...6.5.4...3.9.......1....1..5..3....7.......2.6...4.6.5...1.8.....2../1-XO
........1..2..13...4..5..6...57.6.8.....8.....8.5.47...7..6..5...39..2..9......../2-XO
........2..1..27...3..4..5...49.5.6.....6.....6.4.35...9..3..4...78..1..8......../3-XO
........8..1..27...3..9..5...49.5.6.....6.....6.4.35...9..5..4...28..1..7......../4-XO
.....1..2...2...3...4.5.1....6....787...6...154....6....5.8.7...1...9...9..3...../5-XO
.1.2...3.4...5...2..6...7..8..4.9.......3.......8.5..4..2...6..5...8...9.7...2.1./6-XO
.1.2...3.4...5...6..7...8..9..6.4.......3.......9.5..4..2...7..5...9...2.8...2.1./7-XO
.4.2...8.5...3...2..2...6..9..1.3.......9.......7.5..1..6...4..7...1...5.8...7.2./8-XO
1..2......3..4..2...2...5.16..7.4.8.....8.....8.3.6..75.9...3...7..3..6......9..2/9-XO
8..........47..3...1..4..5..4.6.9.....9.7.6.....3...7..5..2..8...6..74..........1/10-XO
........1..8..17...5..4..2...36.2.4.....3.....2.4.53...4..5..6...79..8..9......../11-XO
..12......3..4..5.4.....6.17..5.4.8.....7.....5.3.8..79.6.....3.8..3..7......92../12-XO
1..........23..4...5..6..7..7.8.6.....9.7.3.....5...6..9..8..3...4..31..........2/13-XO
.1.2...3.4...5...6..7...8..2..9.6.......4.......5.2..4..3...7..6...2...9.8...1.6./14-XO
.....1..2...2...3...1.4.5....6....758...6...441....6....4.5.7...3...9...9..6...../15-XO
.....4....2..3..8...51....72.3....9.7...9...1.9....7.84....56...3..2..1....6...../16-XO
..12...3......45..6...7...27..6.8.9.....9.....9.7.2..88...2...9..45......3...71../17-XO
1..2..3...4..1..2...2..5...6.4....7.....7.....7....8.2...9..5...6..4..8...1..3..9/18-XO
8..........27..6...1..2..5..2.6.9.....3.7.9.....3...7..5..4..8...9..37..........1/19-XO
........1..2..34...5..6..7...68.7.9.....9.....8.6.57...9..7..8...42..3..1......../20-XO
........7..8..12...3..4..9...49.5.6.....6.....6.4.35...9..5..3...28..1..7......../21-XO
........8..1..27...3..4..9...69.5.4.....6.....9.4.36...6..3..5...28..1..7......../22-XO
.....1..2...3...1...4.5.3....6....738...6...554....6....5.8.7...2...9...9..4...../23-XO
..12...3.4...3...5.5....1..6..5.7.4.....4.....4.6.3..7..8....9.5...6...3.9...82../24-XO
.1.2...3.2...4...5..6...7..8..4.2.......8.......5.9..8..3...6..5...2...9.4...7.1./25-XO
.4.6...9.9...3...6..8...2..5..1.3.......9.......7.5..1..2...4..1...7...3.9...6.8./26-XO
.4.8...3.3...5...1..2...6..7..1.3.......9.......7.5..3..6...4..8...1...5.9...8.2./27-XO
1..........23..4...5..2..6..7.8.3.....8.7.3.....4...8..6..9..1...7..82..........5/28-XO
1.....2...3..4..5....6....7..89.5.3.....8.....5.3.48..6....7....8..3..9...2.....1/29-XO
7.....8...4..2..3....7....6..14.3.2.....1.....3.5.21..6....9....2..4..5...8.....9/30-XO
.6.4...9.9...3...4..8...2..7..1.3.......9.......7.5..1..2...8..5...7...3.1...4.6./31-XO
1..........23..4...5..2..6..4.7.3.....3.8.7.....4...8..6..9..1...7..82..........5/32-XO
1...2...3.3.4...5...6...7....3..8....2..5..8....9..2....7...1...9...5.2.3...4...6/33-XO
8..........27..3...1..2..5..2.6.9.....6.7.9.....3...7..5..4..8...3..72..........1/34-XO
8..........47..3...9..4..5..2.6.9.....3.7.6.....3...1..5..2..8...6..79..........1/35-XO
........9..8..67...2..3..1...53.2.4.....1.....1.5.42...3..4..5...67..8..9......../36-XO
..12...3.4...5...6.6....1..7..6.8.4.....4.....4.7.5..8..7....9.6...7...5.9...32../37-XO
.6.4...9.9...3...5..8...2..7..1.3.......9.......7.5..1..2...6..1...7...3.9...8.4./38-XO
.9.8...1.8...2...5..7...3..6..2.8.......6.......4.5..6..1...7..4...8...2.3...2.9./39-XO
1..........23..4...5..2..6..1.7.8.....4.3.7.....4...9..8..6..5...7..32..........9/40-XO
1..........27..3...8..2..5..4.6.9.....6.7.9.....3...7..5..4..8...9..72..........1/41-XO
1...2...3.3.4...5...6...7....3..8....9..4..8....9..2....7...1...8...4.2.3...5...6/42-XO
1..2....3.4..1..5.6.2......4..5.7.8.....4.....7.8.1..4......9.6.1..7..4.3....9..7/43-XO
1..2..3...4..5..6...2..7...8.4....9.....9.....9....5.6...3..6...8..4..5...1..5..7/44-XO
8..........97..3...1..4..5..2.6.9.....3.7.9.....3...2..5..2..8...6..72..........1/45-XO
........9..7..86...5..2..1...23.1.4.....5.....1.2.43...3..4..5...67..8..9......../46-XO
..12...3......14..5...6...77..6.8.5.....5.....5.7.2..88...2...6..39......4...69../47-XO
..12...3.4...3...5.3....1..3..6.4.7.....7.....7.5.3..4..8....9.6...5...7.9...82../48-XO
..4.....7.9...8.1.6...1.2.......3....5..8..9....5.......2.9...4.8.3...5.7.....6../49-XO
1..........97..3...8..4..5..2.6.9.....3.7.6.....3...2..5..2..8...6..72..........1/50-XO
1..2......3..4..5...2...6.13..5.4.7.....7.....7.3.8..46.5...9...4..5..8......9..5/51-XO
1..23.4..5..1......2...6.1.7.....8...3..6..9...9.....5.7.6...2......7..8..1.29..4/52-XO
........9..8..67...4..5..1...51.3.2.....2.....2.5.43...3..4..5...67..8..9......../53-XO
.....1......2...31..4.5.6....7....862...7...454....7....5.6.8..93...8......9...../54-XO
.....1..2..34..5...1..2..6..7.8....6..1.7.9..8....6.7..8..3..9...4..52..3..9...../55-XO
.....4......8...75..5.6.8....1....236...1...885....1....6.3.2..94...7......9...../56-XO
...1..2..3....4..1.5..6..7.8.5....9.....9.....9....6.7.6..2..8.9..5....2..4..3.../57-XO
..12...3.4...3...5.3....2..3..6.4.7.....7.....7.5.3..4..8....9.5...6...7.9...81../58-XO
.1.2.6.4.9...5......2...6..5..7.8.2...........2.5.9..7..3...2......8...9.4.3.2.1./59-XO
.2.4...1.9...5...8..6...7..4..5.8.......9.......3.4..5..1...6..8...4...3.7...2.8./60-XO
.2.7...1.7...4...8..6...7..3..5.8.......9.......4.3..5..1...6..8...3...9.7...4.2./61-XO
.3.4...6.7...8...9..1...2..8..7.4.......5.......9.8..7..6...1..5...9...4.2...3.9./62-XO
.3.5...6.5...9...3..1...2..7..3.9.......4.......8.7..4..6...1..9...7...8.2...5.3./63-XO
.7.4...8.9...5...7..2...6..5..1.3.......9.......7.5..1..6...4..7...3...9.8...1.2./64-XO
1..2....3.2..1..4.5.6......7..8.4.3.....7.....8.3.1..7......6.9.7..8..1.9....2..5/65-XO
2.....1...9..5..7....4....3..67.5.8.....6.....7.9.86..4....3....8..9..6...1.....2/66-XO
2..4....8.1..7..4.4.6......7..1.3.5.....5.....5.7.9..3......6.2.3..9..1.8....7..4/67-XO
3..78.9..5..1......8...4.7.6.....5...3..4..8...8.....2.6.4...1......6..9..2.13..4/68-XO
6..........23..4...5..2..1..1.7.8.....4.3.7.....4...9..6..7..5...7..32..........9/69-XO
7..4....8.1..9..4.4.6......9..7.1.5.....5.....5.3.9..1......2.4.3..7..1.8....2..6/70-XO
8..........27..6...1..6..5..4.6.9.....3.2.9.....3...4..5..7..8...7..32..........1/71-XO
8..........47..3...1..4..5..2.6.9.....3.7.6.....3...2..5..9..8...2..67..........1/72-XO
8..........49..7...1..4..5..2.6.9.....3.7.9.....3...6..5..2..8...6..74..........1/73-XO
8..........67..9...1..4..5..2.6.9.....3.7.6.....3...2..5..2..8...7..32..........1/74-XO
4..........97..6...1..5..2..8.9.6.....3.7.9.....3...4..2..8..1...7..38..........5/75-XO
8..........72..3...1..4..5..2.6.9.....3.7.6.....3...1..5..2..8...6..79..........4/76-XO
.....4......2...75..5.6.3....1....232...1...856....1....6.3.8..94...7......9...../77-XO
.6.4...9.7...3...5..8...6..5..1.3.......9.......7.5..1..2...4..1...7...3.9...8.2./78-XO
8..........47..6...1..5..9..2.6.9.....3.7.9.....3...8..5..4..1...7..34..........2/79-XO
5..........46..9...8..4..1..2.9.6.....6.7.3.....3...2..1..2..5...9..37..........8/80-XO
9..........47..3...1..2..5..8.9.6.....3.7.6.....3...1..2..4..8...6..74..........5/81-XO
1...2...3.3.4...1...5...6....3..7....2..4..7....8..1....6...5...7...4.8.3...9...1/82-XO
1..........23..4...5..6..7..3.7.6.....5.8.3.....9...6..8..9..5...4..82..........1/83-XO
1....2..3..4....5..3..6.7.......38..3...2...6..89.......5.1..4..7....1..9..2....8/84-XO
..12...3.4...5...2.2....6..7..4.5....8..7..4....9.8..7..3....2.5...9...8.6...14../85-XO
1....2..3..4....5..6..3.7.......85..8...2...9..39.......5.1..4..7....6..3..2....5/86-XO
1..2......3..4..5...2...1.44..5.6.7.....7.....7.3.4..68.7...9...6..5..4......9..8/87-XO
1..2......3..4..2...2...5.16..7.3.8.....8.....8.6.4..75.9...4...7..6..3......9..2/88-XO
.....1....2..3..4...56....12.7....8.3...8...6.8....4.34....59...7..2..3....9...../89-XO
1..2......3..4..5...4...1.23..5.4.6.....3.....5.7.6..38.9...7...6..7..4......9..8/90-XO
1..2....3.4..1..5.2.6......4..5.7.8.....4.....7.8.1..4......9.6.1..8..7.3....9..8/91-XO
1....2..3...45..6..7.3..8....8....9.3...4...8.6....7....1..5.8..9..24...5..1....2/92-XO
1.....2...3..4..5....6....7..35.8.4.....3.....8.9.43..6....7....5..8..9...2.....1/93-XO
.1.2...3.4...5...6..7...8..9..5.6.......9.......4.1..9..8...7..6...4...1.3...5.2./94-XO
1..........23..4...5..2..6..3.4.7.....8.9.7.....8...9..6..3..1...7..83..........5/95-XO
1..2....3.4..1..5.6.2......5..7.8.1.....5.....8.4.1..5......9.6.1..7..4.3....9..1/96-XO
.....1....2..3..4...56....75.1....2.2...8...5.8....4.39....76...1..4..3....9...../97-XO
..12......3..4..5.4.....2.63..7.5.4.....3.....7.8.4..39.6.....7.5..7..8......91../98-XO
1..2....3.4..1..5.6.2......4..5.7.8.....4.....7.8.1..4......9.6.1..7..4.3....9..8/99-XO
1..2....3.4..1..5.6.2......4..5.7.8.....8.....8.4.1..7......9.6.7..5..1.3....9..5/100-XO
..12......3..4..5.4.....2.63..7.5.8.....3.....5.8.4..39.6.....8.4..8..7......91../101-XO
.....1....2..3..4...15....62.7....8.4...8...2.8....9.39....65...7..4..2....8...../102-XO
1..2......3..4..1...5...2.46..3.4.7.....7.....7.6.1..38.9...5...1..6..4......9..8/103-XO
1..........23..4...5..2..6..2.7.8.....8.1.7.....4...9..6..3..5...3..71..........9/104-XO
12.3.....4.....3....3.5..2.6...7..8...21..4.......2..6.7..8..9...47..5.......9..7/105-XO
1..2......3..4..5...2...1.35..6.4.7.....7.....7.3.5..48.6...9...4..6..3......9..8/106-XO
1..2......3..4..2...2...5.16..7.3.8.....8.....8.6.4..73.5...9...4..7..6......9..2/107-XO
1..........23..4...5..4..6..7.2.8.....9.3.8.....9...7..1..7..5...3..92..........6/108-XO
..12...3......14..5...6...27..6.8.5.....5.....5.7.2..88...2...7..39......4...69../109-XO
.....1....2..3..4...56....72.7....8.3...8...6.8....4.31....59...7..2..3....9...../110-XO
1..2....3.4..1..5.2.6......7..5.4.8.....8.....8.7.1..4......9.7.1..7..4.3....9..6/111-XO
1..........23..4...5..6..7..8.5.6.....7.9.8.....7...9..9..7..6...4..13..........2/112-XO
1..2......3..4..5...2...1.33..5.6.7.....7.....7.3.4..68.7...9...6..5..3......9..8/113-XO
1..........23..4...5..4..6..7.2.8.....9.7.2.....9...8..6..3..5...7..93..........1/114-XO
.1.2...3.4...5...1..6...7..5..8.1.......4.......9.5..4..7...6..1...8...9.3...9.2./115-XO
........1..2..34...5..6..7...87.5.9.....9.....9.8.65...7..5..8...34..2..1......../116-XO
1...2...3.3.4...5...6...7....3..8....8..4..9....9..8....7...6...2...4.8.3...5...1/117-XO
1..23.4..5..6......2...7.6.6.....8...9..7..2...2.....4.3.7...1......3..8..5.91..6/118-XO
1..2....3.4..1..5.2.6......7..5.4.8.....8.....8.7.1..4......9.6.1..7..4.3....9..7/119-XO
1..2......3..4..1...5...3.26..7.1.3.....6.....1.3.4..68.9...5...4..7..6......9..8/120-XO
.1.2.3.4.8...6......2...7..5..6.8.2...........2.9.5..8..4...2......5...9.3.7.2.1./121-XO
.1.2.3.4.5...6......2...3..7..6.5.2...........2.7.8..6..9...2......8...7.4.1.2.9./122-XO
..1.....2.3...4.5.6...7.8.......3....7..5..9....9.......2.4...1.4.5...3.8.....6../123-XO
.1.2.3.4.5...6......2...7..6..8.9.2...........2.6.5..9..3...2......5...8.4.7.2.1./124-XO
..12...3......45..2...6...77..6.8.9.....9.....9.7.2..88...2...9..45......2...31../125-XO
..12......3..4..5.5.....2.16..5.4.7.....7.....7.3.6..53.8.....9.4..3..6......98../126-XO
.....1......2...13..4.5.6....7....655...7...843....7....5.6.8..29...8......9...../127-XO
.....1....2..3..1...45....62.3....7.4...7...8.7....1.49....65...3..2..4....9...../128-XO
.....1....2..3..4...56....72.6....8.3...8...5.8....4.39....71...6..2..3....9...../129-XO
...1..2..1....3..4.4..5..6.6.5....7.....7.....7....4.8.6..8..4.7..2....9..3..9.../130-DXO
1..2..3...4..5..6...5..1...5.7....8.....8.....8....4.6...9..7...5..7..4...9..3..2/131-DXO
.....8....6..9..3...12....89.7....5.6...5...9.5....3.64....21...7..3..6....4...../132-DXO
...1..2..3....4..5.6..7..4.7.6....8.....8.....8....9.4.7..4..9.6..3....1..5..2.../133-DXO
1..2..3...4..5..6...7..4...8.4....9.....9.....9....5.6...1..6...8..4..5...2..3..7/134-DXO
.....1.2..3...4.....56..4..3......7...4.6.1...8......2..1..65.....9...8..7.5...../135-DXO
...1..2..3....2..1.2..4..5.5.4....6.....6.....6....7.8.8..5..7.2..9....6..9..3.../136-DXO
1..2..3...4..5..6...7..1...7.5....8.....8.....8....4.6...9..7...7..4..5...9..3..2/137-DXO
.....1....2..3..4...15....62.7....8.3...8...7.8....4.35....69...7..2..3....9...../138-DXO
.....1....2..3..4...15....63.7....8.2...8...3.8....4.25....69...7..2..3....9...../139-DXO
...1..2..3....4..1.1..5..6.6.5....7.....7.....7....8.9.9..6..8.4..2....7..1..3.../140-DXO
.....1.2..3...4.....56..1..2......7...8.6.5...9......3..1..68.....8...9..7.5...../141-DXO
...1..2..1....2..3.4..5..6.7.4....8.....8.....8....6.5.5..7..4.4..5....9..3..9.../142-DXO
.....1....2..3..4...56....72.8....9.3...9...2.9....4.36....71...8..4..2....5...../143-DXO
.....1..2...3...4...5.6.7....8....766...8...995....8....6.7.9...3...4...1..2...../144-DXO
.....1.2..3...4.....56..1..7......3...8.6.4...2......9..4..65.....8...7..9.5...../145-DXO
1....2..3...14..5..6.3..1....6....7.8...2...1.5....9....8..4.9..7..38...4..2....8/146-DXO
1..2..3...4..5..6...2..7...7.4....8.....8.....8....5.6...5..9...7..4..5...9..3..1/147-DXO
8..76.9..5..1......7...4.1.2.....3...3..4..7...5.....9.6.4...3......6..8..2.73..6/148-DXO
.....1.2..3...4.....45..6..7......8...9.5.4...2......3..6..59.....9...7..8.6...../149-DXO
...1..2..3....2..4.5..6..7.6.5....8.....8.....8....9.7.6..7..9.4..9....1..9..3.../150-DXO
1..2.3.....4.5.3.....6...7.34....8..8.......5..5....39.2...1.....3.8.9.....3.7..6/151-DXO
1..2.3.....4.5.6.....4...2.45....7..7.......6..6....84.9...4.....7.8.4.....1.9..3/152-DXO
1..23.4..5..1......3...6.1.7.....8...2..6..3...5.....4.9.6...2......9..8..7.23..1/153-DXO
.....1..2...2...3...4.5.6....7....866...7...554....7....5.6.8...1...9...9..3...../154-DXO
...1..2..2....3..1.3..4..5.4.3....6.....6.....6....7.5.4..5..7.8..4....9..9..8.../155-DXO
.....8.4..9...3.....12..3..7......9...6.2.8...5......4..8..21.....6...5..7.1...../156-DXO
...1..2..3....4..5.5..6..4.6.5....7.....7.....7....8.4.6..4..8.1..3....9..9..2.../157-DXO
...1.2.....3.4.2...5.3....1..6....74....6....32....6..8....5.9...2.3.7.....8.9.../158-DXO
1..2.34..2..1......5..6....5.2....7...7...8...8....2.6....7..8......9..2..94.2..3/159-DXO
...1..2..3....4..5.6..7..4.7.6....8.....8.....8....9.4.7..4..9.8..2....1..5..3.../160-DXO
1..2.34..2..4......5..6....5.2....7...7...8...8....2.6....7..8......9..2..91.2..3/161-DXO
1..2..3...4..5..6...5..3...7.4....8.....8.....8....5.6...9..6...5..7..4...2..1..9/162-DXO
.....1....2..3..4...15....64.7....8.2...8...4.8....2.39....65...7..4..3....9...../163-DXO
1..2..3...4..5..6...6..1...7.5....8.....8.....8....4.6...9..6...7..4..5...9..3..2/164-DXO
.....1.2..3...4.....56..4..3......7...4.6.1...8......2..1..65.....5...8..7.9...../165-DXO
1..2..3...4..5..6...7..1...8.4....9.....9.....9....5.6...5..2...8..4..5...3..7..8/166-DXO
.....1.2..3...4.....56..1..3......7...1.6.4...8......2..4..65.....5...8..7.9...../167-DXO
1..2..3...4..5..6...7..8...7.4....9.....9.....9....5.6...3..1...7..4..5...8..5..2/168-DXO
1..2..3...4..5..6...3..7...8.4....9.....9.....9....5.6...1..6...8..4..5...7..8..2/169-DXO
.....1....2..3..4...15....62.3....7.4...7...3.7....4.89....65...4..8..3....9...../170-DXO
.....1....2..3..4...15....62.7....8.3...8...2.8....4.39....65...7..4..2....9...../171-DXO
.....1..2...3...4...5.6.7....8....979...8...665....8....6.7.9...3...4...1..2...../172-DXO
.....1..2...3...4...5.6.7....8....799...8...665....8....6.7.9...1...2...3..4...../173-DXO
1..2..3...4..5..6...2..7...2.4....8.....8.....8....5.6...9..1...2..4..5...7..3..9/174-DXO
.....1....2..3..4...15....62.3....7.8...7...3.7....4.85....69...3..2..8....9...../175-DXO
...1..2..3....4..5.6..7..8.8.6....5.....5.....5....9.7.7..8..9.6..2....1..4..3.../176-DXO
.....7......9...87..5.6.3....1....322...1...556....1....6.3.2..94...8......4...../177-DXO
...1..2..3....2..4.5..3..6.5.3....7.....7.....7....8.6.3..6..8.9..8....1..4..9.../178-DXO
.....1..2...3...4...5.6.7....8....799...8...665....8....6.7.9...3...4...1..2...../179-DXO
...1..2..2....3..4.5..2..6.7.5....3.....3.....3....8.6.7..6..8.1..4....9..9..2.../180-DXO
1..23.4..5..6......3...7.6.8.....9...4..7..3...5.....8.8.7...2......4..9..1.23..6/181-DXO

Monday 15-Jul-2019

... by: SuDokuFan

@BobW
The following WU's have known valid JE patterns:
28, 49, 66, 136, 143-145, 155-156, 158-171, 173-182, 184-194, 196-198, 200-218, 220, 222-223, 225-229, 232, 234-241, 243-249, 253-258, 260-262, 264-265, 270-271, 275-276, 279, 281-282, 284-286, 288, 293, 295, 297, 304-306, 313, 316, 320, 322, 328, 330, 337, 341, 343, 346, 350. If you're looking for valid JE examples these are a good place to look, despite the vast majority being found in isomorphs of the exact same puzzle.

Monday 15-Jul-2019

... by: BobW

Algo, In your second set, my solver detected JE's in the following puzzles:
1, 3, 4, 5, 7, 10, 13, 15, 17, 18, 19, 20, 22, 23, 30, 35, 38, 40, 46, 47, 50*, 56*, 57, 59, 60, 62, 63, 66, 67, 69, 71, 73, 76, 78, 81, 89, 90, 98, 99.

Puzzles 50 and 56, were especially interesting because the JE didn't appear until after several difficult eliminations. In the other puzzles, the JE would be detected almost immediately.

Sunday 14-Jul-2019

... by: Algo

@SuDokuFan, @BobW
Yes, my solver only identify possible base cells and target cells that do not see each other, base cands not in companion cells, and each base cand does not occur more than twice in each cross-line. In the first example you pointed out, my solver did an invalid elimination of 3 from H5 which is the solution.
Still digesting what SuDokuFan has written to identify valid JE patterns. Here are more puzzles that may contain valid JE.
8..........27..3...1..2..5..2.6.9.....6.7.9.....3...7..5..4..8...3..72..........1/ #1
..1..5..8.5..2..7.8..9..6....4..3..9.8.....4.7..6..5....5..1..4.1..3..2.3..2..1../ #2
.....1.2..3...4.....45..6..7......8...9.5.4...2......3..6..59.....9...7..8.6...../ #3
1..2......3..4..2...2...5.16..7.3.8.....8.....8.6.4..73.5...9...4..7..6......9..2/ #4
........9..8..67...4..5..1...51.3.2.....2.....2.5.43...3..4..5...67..8..9......../ #5
......3..84.....9...9..652...8.1.7.......2.4.16........9..3...7.......1.6..7.98../ #6
.....1....2..3..4...15....62.7....8.4...8...2.8....9.39....65...7..4..2....8...../ #7
.4..5...........84.369...7.1...7.......5.......98.62..4......3......2.16.1.687..5/ #8
.48...1......2...5.........5......4.6...9.....7....8.....8.4.3.2.5.........1...../ #9
.....1..2...2...3...1.4.5....6....758...6...441....6....4.5.7...3...9...9..6...../ #10
....75....1..2.....4...3...5.....3.2...8...1.......6.....1..48.2........7......../ #11
....8.....4..912.5..7........1..46...8....5...9.25..14..5...76.3..5..9..4.9.....3/ #12
..12...3......45..2...6...77..6.8.9.....9.....9.7.2..88...2...9..45......2...31../ #13
.4.2.....3.....6........1...2.....74....3........1......1...5.3...4...2.6....8.../ #14
.4.6...9.9...3...6..8...2..5..1.3.......9.......7.5..1..2...4..1...7...3.9...6.8./ #15
.1...2.3.3..1....4..235......6...4...7..2..1...8...9......356..8....7..9.6.2...5./ #16
.....1....2..3..4...15....67.3....8.2...8...7.8....4.94....65...3..2..7....9...../ #17
1..2......3..4..2...2...5.16..3.7.8.....8.....8.6.4..77.5...9...4..7..6......9..2/ #18
.7.3...6.3...5...7..2...8..9..1.3.......9.......7.5..1..6...4..1...3...5.8...4.2./ #19
..12......3..4..5.4.....6.17..5.4.8.....7.....5.3.8..79.6.....3.8..3..7......92../ #20
..1..2..3.3..4..5.6..3..7....6..8..2.5.....6.9..1..5....7..4..5.6..3..4.4..9..8../ #21
9..........47..3...1..2..5..8.9.6.....3.7.6.....3...1..2..4..8...6..74..........5/ #22
..12......3..4..5.5.....2.16..5.4.7.....7.....7.3.6..53.8.....9.4..3..6......98../ #23
1..6..8...7..8..6...8..3..24....25...5..9..2...95....39..1..2...1..4..7...6..8..1/ #24
.3.5...6.5...9...3..1...2..7..3.9.......4.......8.7..4..6...1..9...7...8.2...5.3./ #25
1.7..259.4...8.7....2......54.1......8.7..6........94.....7.....65..94..3......../ #26
.2.....1.1..6....3..7..89..6....47...1.....3...85....2..13..5..5....9..4.7.....8./ #27
...32.5...9..5..21.....8....86..4........614.1...9..62.......9.5...6...8..1.4...6/ #28
1..2......3..4..1...2...3.56..4.5.7.....1.....4.7.6..13.8...9...6..7..5......9..8/ #29
...1..2..1....2..3.4..5..6.7.4....8.....8.....8....6.5.5..7..4.4..5....9..3..9.../ #30
.1...2.3.3..1....4..435......1...4...6..7..5...7...6......258..8....6..5.9.7...6./ #31
...1.9..82......3.6..4......8..9........2.6...1..........8...5.3.....2........7../ #32
1....2..3.3.4..5....6....7..8..2.......9.1..29...34....7....8....5....6.3...9...4/ #33
..38......9...45..2......8.3..1...7.....9.....5......4.4......6..73...4......59../ #34
.4..6.1..5..3...........8..3.2....5......14............1..74......5...32........./ #35
.......1......1.23..4.5.......2...4...5.1.6...1...3.......7.4..32.8......5......./ #36
.6...3......51....4...8...3.3....95...8.6...7...75...1..1...3...5.8...1...2...574/ #37
.....8.4..9...3.....12..3..7......9...6.2.8...5......4..8..21.....6...5..7.1...../ #38
...2.8.6.3.1...............5...1.3.4.2.4...........7...8.....2....7..6......3..../ #39
8..........67..9...1..4..5..2.6.9.....3.7.6.....3...2..5..2..8...7..32..........1/ #40
..3......2.......6..6.7.5.......9...16....7..9.7.8.6.3..2.....9.8...3...394..6..5/ #41
7....2.4..6.5..9.......81..3.7.........7.1...8..4....5..........96...7..1..8.3..4/ #42
4.....7.....9...8.....5.1.9.1.7.....3...4.8....2..6.3...62......7...1...8...9...4/ #43
..384......1........9...284...1.4..26...2...14..6.3...927...1........8......526../ #44
3..1.6.5.7.9...2...............7.3.9.1.5.................8....4.6.....1.....9..../ #45
6..........23..4...5..2..1..1.7.8.....4.3.7.....4...9..6..7..5...7..32..........9/ #46
1..........23..4...5..2..6..7.8.3.....8.7.3.....4...8..6..9..1...7..82..........5/ #47
1.347...........2.9.5..1..45...43..9....8...7.38..5.....6...9.......7...4..6..1../ #48
............1.234....7.985..49...51...........35...48..279.1....984.3............/ #49
8...7...6......1.2......3...162.........4..7..5.......7.9....4......1......3...../ #50
....3.4.....69.....714...2.2.7....1..15...27..8....6.5.2...418.....26.....8.7..../ #51
...3..1.58..4..6..9........2...8.......7....3.............9..8..5...2....3.....4./ #52
7.3....8.....12............5..7...3..1..5....4.6.......8....1.5......2.....3...../ #53
.48...1......2...7.........2......4.5...9.....6....8.....8.4.3.7.2.........1...../ #54
2..1..5...7..3..8...8..2..38..7..9...5..4..3...7..5..87..9..6...6..1..9...4..6..1/ #55
5..1.........456...812.6...65...8..231.....562..6...41...5.126...543.........9..3/ #56
..12...3.4...3...5.3....1..3..6.4.7.....7.....7.5.3..4..8....9.6...5...7.9...82../ #57
.5.2.4....13...9...........6......457...1...........2.....3.1..4..5......8......./ #58
8..76.9..5..1......7...4.1.2.....3...3..4..7...5.....9.6.4...3......6..8..2.73..6/ #59
1..........23..4...5..2..6..4.7.3.....3.8.7.....4...8..6..9..1...7..82..........5/ #60
..4..95..7...4...3.9.1..........8.974.8...1.596.7..........6.1.8...3...9..74..3../ #61
2.....1...9..5..7....4....3..67.5.8.....6.....7.9.86..4....3....8..9..6...1.....2/ #62
.4.2...8.5...3...2..2...6..9..1.3.......9.......7.5..1..6...4..7...1...5.8...7.2./ #63
.....1..2..3..456..7..5..3....8...9...4..7..683..46....1....6...487....99...1..2./ #64
3...85..........41..........6.74....5.....3........2.......352..4.6........1...../ #65
.2.6...8.1...5...2..4...7..5..1.2.......3.......9.5..3..7...4..2...1...9.8...9.6./ #66
.9.8...1.8...2...5..7...3..6..2.8.......6.......4.5..6..1...7..4...8...2.3...2.9./ #67
.8...3.4..35.94...9..6.8..51.....2...2..8..54.7...6...................3.3.25..9.8/ #68
.....7......9...87..5.6.3....1....322...1...556....1....6.3.2..94...8......4...../ #69
2.1..3...5...7.9..9....2.636..3..5......2......9..5..149.6....5..8.4...9...9..3.4/ #70
.6.4...9.9...3...4..8...2..7..1.3.......9.......7.5..1..2...8..5...7...3.1...4.6./ #71
.....1..2..7.2..5..5..6.1.7...4...8..74....6.8....32....1..5..6.6.93....9.5...3../ #72
.1.2.6.4.9...5......2...6..5..7.8.2...........2.5.9..7..3...2......8...9.4.3.2.1./ #73
..78......3...64..9......7.5..9...4...........6...2..5.5......3..94...8......36../ #74
...3..6.8..72......1...........7..153..6.....2........6.....3.......5.4.....1..../ #75
1...2...3.3.4...5...6...7....3..8....2..5..8....9..2....7...1...9...5.2.3...4...6/ #76
6..2...5...93...7..2....8.......3149...1.8...5419...8...4....9..7...95...6...2..4/ #77
.4.8...3.3...5...1..2...6..7..1.3.......9.......7.5..3..6...4..8...1...5.9...8.2./ #78
..3..7....47...3.29.5..1.......7.23......9.1..8...45...........5.2...6.9....5.8../ #79
1.5..9.8..2......19..4....7..3.6.2.....3......9.........82...3.....14........7..4/ #80
5..........46..9...8..4..1..2.9.6.....6.7.3.....3...2..1..2..5...9..37..........8/ #81
..4...28.....5..1....9....6..3.......8.41..3...53.716..7................96..8.3.1/ #82
....69.....1....5....3...8..16.....532.7..8......4.3......9.5..7..6....46.5....1./ #83
914.7.....8.9............3.8..1329.....8.........9.7.5.6.78....4.1..6.........3../ #84
.2.....5.......6.3.6.1..7....7....89.9.5.....8...7.3.5...9.4.7..14......5.28.3.9./ #85
.57.3.289........5.2..59.17..8..1..42.9.........32..........198.81......3......4./ #86
....3...6.3...6.2..7.5...3.92..1....7..6.3..2....5..73.8...2.5..4.7...9.3...6..../ #87
216...879............6.2.1.52...9....6.531.8....2...57.9.7.8............782...431/ #88
.....1......2...13..4.5.6....7....655...7...843....7....5.6.8..29...8......9...../ #89
3..78.9..5..1......8...4.7.6.....5...3..4..8...8.....2.6.4...1......6..9..2.13..4/ #90
..78......2...16..4......2.2..3...8.....4.....6...9..1.1......7..82..........64../ #91
...416.....8...9...3.....7.5....8..37.......21..2....4.4.....1...6...8.....935.../ #92
52.....9..6.8.1..............1...8.37...5..........6....86.........2..5.4......../ #93
.691.7..8..2.....6.8....1.....7...32.9...8.....63..8...7...4.......5..4.5....6.../ #94
.3..6....8...9.2..9..34...1......8.............9.8.5462.64.......72...5.....5...7/ #95
....2.14......7.....19...754.36.....7.....9.....2.....1.7.4..3.6....3.5.8......6./ #96
4..3.8..........517.........2.7.....3.....8......5.....65.1.......4..3.........6./ #97
2..4....8.1..7..4.4.6......7..1.3.5.....5.....5.7.9..3......6.2.3..9..1.8....7..4/ #98
.2.7...1.7...4...8..6...7..3..5.8.......9.......4.3..5..1...6..8...3...9.7...4.2./ #99
1..2..3...2..1..4...5..6..15..6..7...1..8..3...6..9..89..5..8...5..6..9...3..2..4/ #100

Sunday 14-Jul-2019

... by: BobW

My solver identified exactly the same JE's that SuDokuFan found using Andrew's solver. For all of the others, my solver solved them (except #15 & #18) with forcing nets without encountering any valid Jexocets. I placed the JE routine ahead of the forcing nets routine, so that it would always check for a JE before trying a forcing net. My solver had to resort to full recursive T&E to solve #15 & #18, and didn't identify any JE during those solutions either. So, my solver seems to be in agreement with Andrew's for identifying JE's. But, in the process of testing, these puzzles exposed an error in how my solver is applying D.P. Bird's elimination rules #3 and #8. So it turned out to be a useful exercise. Back to the drawing board. :-)

Sunday 14-Jul-2019

... by: SuDokuFan

@Algo, I've found problems with most of the puzzles you have posted with claims that JE patterns exist there. The following have CONFIRMED JE patterns by Andrew's solver:
0001002001...- Exocet pattern 1239 base D79, targets F5 and E2, Exocet pattern 1239 base F13 targets D5 and E8.
000001000020030040...- Exocet pattern 156 base F13 targets D5 E8 (also another unsolvable, however becomes solvable when all possible JE eliminations are used)
100230400...- Double exocet pattern, AB6 E4 G5, HJ4, E6, C5 on base 1589
200000100...- Exocet pattern 1234 base E46 D2 F8. Also unsolvable by Andrew's solver, extra exocet eliminations do not help.
Also the following are interesting as they are unsolvables:
003006002...
100200000...

Sunday 14-Jul-2019

... by: SuDokuFan

Looks to cause contradictions as I look at it on the solver, @Algo. 9 occurs more than twice in cover-line row B, also mirror cells H46 do not contain ANY base digits which proves that it is not even a provable exocet, much less a JE.

Sunday 14-Jul-2019

... by: Algo

After about twenty odd steps, my solver found Base=I1+I2. T1/T2:H5/G8 | Base=1469 T1/T2:H5=1349/G8=13569 / pv removed 3 : H5=3,G8=35

but unable to solve the puzzle.

Sunday 14-Jul-2019

... by: SuDokuFan @Algo

For the first example you posted can you tell us clearly where you believe the JE appears, I'm seeing multiple possible ones (the one 1.2...3..)

Sunday 14-Jul-2019

... by: SuDokuFan

@BobW
Those two exocets I posted are examples of what I call "hidden" Exocets, aka there is an extraneous base digit past the limit of 4, however if that digit is not found in either of the potential targets then that digit can be removed given the pattern is true for all other digits. There is probably a complex chain somewhere that could eliminate those digits but I did not look for that.

Sunday 14-Jul-2019

... by: Frans Goosens

With trial and error

Combination A2=245 and F9=257

************************************************************
A2=2 F9=2 Wrong, Undo calculation

All reset to initial position

************************************************************
A2=2 F9=5 Wrong, Undo calculation

All reset to initial position

************************************************************
A2=2 F9=7 Wrong, Undo calculation

All reset to initial position

************************************************************
A2=4 F9=2 ( C6=9 ) Solved,


#356--------------------------Solution
700 008 009-------------746 538 219
003 000 500-------------293 146 587
010 000 060-------------518 279 463

005 060 030-------------175 462 938
800 007 000-------------829 317 645
060 800 100-------------364 895 172

400 720 000-------------451 723 896
000 980 004-------------632 981 754
000 004 020-------------987 654 321

Total solving time is : 95 sec.
Number of logical steps is : 8611

Sunday 14-Jul-2019

... by: Algo

@BobW, Wish you success and these are some puzzles that I think could possible contain JE. See how many your solver detects and let me know if you need more.

1.2...3...4...6...3...5...1...2.5.7...8...6...3.4.1...8...7...4...5...2...5...7.8
......1.5.4..9...2..9327.....1..3...9...4..7..5.....2....8...1.8..9....3.9.67...8
.....7.32....5.681...8..74...5..4..8.2.....6.3..9..4...42..3...153.8....67.5.....
...1..2..1....2..3.4..5..6.7.4....8.....8.....8....6.5.5..7..4.4..5....9..3..9...
1..2......3..4..2...2...5.46..7.4.8.....8.....8.3.6..79.5...3...7..3..6......9..1
.18.4....5.2..7..8......24.............1.938..36...5.....4.1....745.6.......9271.
1....2..3..45..6...2..3..7.2......8...8...7...7......9.8..5..6...5..13..4..9....5
.......1......1.23..4.5.......2...4...5.1.6...1...3.......7.4..32.8......5.......
....6.18....4.3....9....2.......8...4..59..7.8..7...91.6.3...4...3.5.8...2......5
1..36........8.....2.....9.......96..7......46.8...5.7...6..1.5.....2...49.5.3..2
84...5.9.5.7..9....9..1......357.....59...81.....932......5..6....6..1.5.1.9...78
.....123.1...4....5..6.....6..4.75...2.....1...32.8..4.....6..7....9...8.685.....
.....1.2.3..45......6.2.4..1...7..8..891.267..7..8...4..5.6.8......13..9.3.5.....
..1..2..3.4..1..5.6..3..1....7..8..5.2.....8.5..7..9....4..9..1.6..8..9.7..4..3..
.....1....2..3..4...15....67.3....8.2...8...7.8....4.94....65...3..2..7....9.....
..3...6.....43.....9....74.7.......9.3......6..8.41.7.82.....9...12........5.78..
39.6.......2.......1..8.75......5....7..1..8....4......38.5..7.......6.......7.92
..3..6..2.8..5..3.4..3..7....6..9..4.9.....1.8..7..6....1..4..5.2..1..4.3..2..1..
.....1..2..3..245..5..6..7....1...2...1..6..787..35....3....6...846....99...4..8.
9.....57..37........2.....4...62..4.8..4..72.6.....3.8..3.1.897..8......2....3..1
........1..2..345..6..7.83....2...1...9..1..4.4..98....84....9..275..6..6...8....
..384......1........9...284...1.4..26...2...14..6.3...927...1........8......526..
.....1..2..3..456..7..5..3....8...9...4..7..683..46....1....6...487....99...1..2.
1..23.4..5..6......3...7.6.8.....9...4..7..3...5.....8.8.7...2......4..9..1.23..6
......8.6.1...2.3...5.7.......3...4...8.6.7...4...1.......5.9...3.8...1.6.7......
....3.48.8..6.1.9...7..26..51.........327.........32....89..36...1..7...4........
2.....1...9..5..7....4....3..67.5.8.....6.....7.9.86..4....3....8..9..6...1.....2
8..............35.2.3.7....4...9...31.76.5.8..3..2..76.......64.5.8.......43.9...
..124.....5...8.1.7.4..5....1......5.8295134.3......2....5..2.4.9.4...3.....865..

Sunday 14-Jul-2019

... by: BobW

Algo, I believe my program is now correctly detecting JExocets, and I'm in the process of implementing David P. Bird's candidate elimination rules. I'm up to rule 8 of 12. I wish there was a larger set of JE example puzzles to use for testing.

SuDokuFan, Nice work on the solution. I was wondering how you eliminated digit 6 from HJ7 in order to get the base set down to 3789.

Sunday 14-Jul-2019

... by: Algo

@Bobw @SuDokuFan, I am impressed by SuDokuFan solving the puzzles using Exocet but still stuck with identifying JE. Hope to find time to find out more add it to my solver program.

Saturday 13-Jul-2019

... by: SuDokuFan

Once the Bowman Bingo step is reached on my first exocet proposition, there is a second exocet in the grid that reduces the puzzle to singles, basics and unique rectangle.
1345 DE4 G6 B2, however 3 in G6 is given/solved so that gives E4=3 Once this is known and the standard eliminations are applied (-2D4 -79B2) then the above reduction in difficulty is received.

Saturday 13-Jul-2019

... by: SuDokuFan

@jkl, thanks for the clarification, that this puzzle is the exact same puzzle that was posted 4-5 years ago. No one solved it logically back then, wonder if anyone will be able to do any better than my exocet and forcing net strategy this time around?

Saturday 13-Jul-2019

... by: jkl

Hi SuDokuFan!
"THAT" means that puzzle #356 is identical (true isomorph of) to puzzle #85
Best regards

Saturday 13-Jul-2019

... by: SuDokuFan

@BobW, I'm glad mine and Algo's discussion was of good use.

@jkl, what does THAT mean?

@David (puzzle creator), good puzzle, I'm completely stumped. (and so are HoDoKu and Xsudo without guessing)

Despite this I did try and found an Exocet that made this one solvable with nets (aka Bowman Bingo): 3789 HJ7, F8, C9. This exocet forces a 3 in C9 and locks 79 in F8, eliminating 8 from HJ7. Exocet would also lock 3 into one of the base cells therefore eliminating 3 from all ofther cells in box 9 (in this case G7)

Saturday 13-Jul-2019

... by: James Havard

1 min. 20 sec. and 38 subs. 4 subs to get a basics solve- A2=4,A5=3,B4=1,C7=4.

Saturday 13-Jul-2019

... by: jkl

#85

Saturday 13-Jul-2019

... by: BobW

Single cell backdoor: J1=9 leads to solution involving 18 rather horrible inference nets/chains. Hardly worth mentioning.

With three cell backdoor, A2=4 A4=5 D7=9 it's solvable with basics.

Couldn't find a two cell backdoor that renders it solvable with basics, but with G2=5 J7=3, it's solvable with two Y-wings.

With the discussion two weeks ago by SuDokuFan and Algo (thanks for that, btw), I've been motivated to get working on my solver program again. I've got it well on the way to identifying JE's. Hopefully, by next week, that part will be working.

Archive

Each week a new 'unsolvable' will be published and the previous will be accessible here from this archive section. If you like very tough puzzles, these are for you.
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