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Here is your mate in 10: FEN: r5kr/pp2q1pp/2pp3B/3n2Q1/3P4/P4R2/6PP/5RK1 w - - 3 8 Chest 5.2: FEN: r5kr/pp2q1pp/2pp3B/3n2Q1/3P4/P4R2/6PP/5RK1 w - - (9+11) Position-Analysis: C0/R0/K1/P7/X32 W:8/41 Search for 1. Special-Mate [C0/R0/K2/P9/X42] in 126 ... (Hash=2044MB) 10 3:08:42 6.085.802.965 1.043.79...

Hello: The proposed lines between mate in 20 and mate in 17 differ in 12. ... a6 and 12. ... b6, respectively. I searched with Chest 5.2 from this discrespancy just after 12. Qg4 (DefenderMoves option checked) but it did not reach the last ply to probe the mate in 17 after 30 minutes or so because ...

FEN: 4r3/2k1p2q/pp1nR1p1/2pP1pP1/2P2P2/1P6/P1K3B1/4Q3 w - - 0 1 Fire_7.1_x64_popcnt: 33 04:29 2.707.822.029 10.105.472 +M29 Te6xd6 Rc7xd6 De1-e6+ Rd6-c7 De6-c6+ Rc7-d8 Dc6xb6+ Rd8-d7 Db6-b7+ Rd7-d8 d5-d6 e7xd6 Db7xh7 Te8-e2+ Rc2-d3 Te2xg2 Dh7xg6 Rd8-c7 Dg6-f7+ Rc7-b8 Df7-d5 Tg2xa2 Dd5xd6+ Rb8-b7 Dd6...

Try P2/X9.

Best.
Ignacio

I have been remiss in reporting my results. This is the one that I have not solved yet: 8/2ppK1p1/2pn2pb/p2b2pk/3R2Rn/B2PP2P/P7/5B2 w - - acd 49; bm Bxd6; ce 2043; dm 24; pv Bxd6; These two I am verifying by 80 ply back-to-front searches of the pvs reported by Mike: 8/1ppr4/br6/1pkp4/2p1Qp2/KPp2p2/...

I have been remiss in reporting my results. This is the one that I have not solved yet: 8/2ppK1p1/2pn2pb/p2b2pk/3R2Rn/B2PP2P/P7/5B2 w - - acd 49; bm Bxd6; ce 2043; dm 24; pv Bxd6; These two I am verifying by 80 ply back-to-front searches of the pvs reported by Mike: 8/1ppr4/br6/1pkp4/2p1Qp2/KPp2p2/...

Mate in 19.

Try Fire 7.1

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