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Another option is DiagTransfer: http://alain.blaisot.free.fr/DiagTransf ... h/home.htm

Walter, one correction in number 6: after 1.Nf6 Rxd5 2.Nxd5 f5 now is mate in 8 with 3.Kb6 (no 3.Rc5).

Ignacio

Gustav says Mate in 39: 1.Sc7-e6 Ld4-e3 2.Se6-g7 Le3-g1 3.Sg7-f5 Lg1-c5 4.Sf5-h4 Lc5-d4 5.Sh4-g2 Ld4-f2 6.Sg2-f4 Lf2-d4 7.Sf4-d3 Ld4-c3 8.Sd3-c5 Lc3-d4 9.Sc5-e4 Ld4-e3 10.Se4-g3 Bh7-h6 11.Sg3-f5 Le3-c5 12.Sf5-h4 Lc5-d4 13.Sh4-g2 Ld4-f2 14.Sg2-f4 Lf2-d4 15.Sf4-d3 Ld4-c3 16.Sd3-c5 Lc3-d4 17.Sc5-e4 Ld4...

My analisis:
1.Qf3 Rh8 2.h5 and now:
a) 2... Nxe3 3.fe3 Qxg5 4.0-0-0 winning.
b) 2... Kf8 3.Ng4 Ke7 4.g6 Kd7 5.Nf6+ Kc7 6.Kd2 and white is better.

Thanks for that pgn subvariation for Mate in 55, saved it on my backups. Here's a puzzles from yacpdb position 67722 published as Mate in #42, but there seems to be a faster mate in 24. [d]8/p5p1/4p3/4Pp2/2R2P1K/3P1P2/pk1p4/qrbB4 Published as Mate in 42 at yacpdb position 67722, but there's a cook?...

Qc5 and Qe3 lose too, and there are no other moves. check better with your fish. [d] 8/1p3Qpk/pq5p/4K2P/6P1/5P2/P1P5/8 b - - 12 48 Perhaps there was confusion. In the position above, which I think appeared in both games you posted, Black played Qb2+, which seems to lose (evaluation for White goes a...

Rodolfo Leoni wrote:W King is tied to black f4 pawn. B King will always move Kd7-d8-d7-d8.... A clear and easy draw. But engines cannot see it.

[d]8/8/1P1k3p/3P2pP/4KpP1/8/8/8 w - - 1 71

If B king moves Kd8 is 1-0. Correct is Kd7-d6-d7-d6.

Again, you have a wrong FEN. [d]8/3k2p1/3P1p1p/8/1Pp3P1/2P1p3/6P1/5K2 b - - 0 15 FEN: 8/3k2p1/3P1p1p/8/1Pp3P1/2P1p3/6P1/5K2 b - - 0 15 Stockfish-8SE-x64-popcnt_tp: 1/1 00:02 215 107.500 +1,04 Rd7-c6 2/2 00:02 356 178.000 +1,10 Rd7-c6 b4-b5+ Rc6xd6 3/3 00:02 510 255.000 +1,10 Rd7-c6 b4-b5+ Rc6xd6 4/4...

What about Kf7 (not Qxg4)after Qg4+? Ignacio. won in all lines. Rc7 Qg4 hg4 Ke6 Rd7 Kd7 Kf1: [d]8/3k2p1/3P1p1p/8/1Pp3P1/2P1p3/6P1/5K2 b - - 0 15 or, Rc7 dc7 f5 Qe2 Ke7 c8q Qc8 Qe3 Qe6 Qc5 Ke8 b5: [d]4k3/6p1/4q2p/1PQ2p2/2p5/2P4P/6P1/6K1 b - - 0 18 and this queen ending is won too The first position ...

What about Kf7 (not Qxg4)after Qg4+? Ignacio. won in all lines. Rc7 Qg4 hg4 Ke6 Rd7 Kd7 Kf1: [d]8/3k2p1/3P1p1p/8/1Pp3P1/2P1p3/6P1/5K2 b - - 0 15 or, Rc7 dc7 f5 Qe2 Ke7 c8q Qc8 Qe3 Qe6 Qc5 Ke8 b5: [d]4k3/6p1/4q2p/1PQ2p2/2p5/2P4P/6P1/6K1 b - - 0 18 and this queen ending is won too The first position ...