Engine: ChestUCI Ver.5.2 (0 MB)
von Franz Huber
FEN: 5B2/5R2/2p3K1/8/2P1P1PP/1p1BpPP1/prp1p3/bk1bR3 w - - (11+10)
Stellungs-Analyse: C0/R0/K2/P2/X2 W:10/36
AutoTurbo-Suche nach Spezial-Matt [C1/R0/K2/P0/X0] in 15 ... (Hash=2044MB)
AutoTurbo-Suche nach Spezial-Matt [C0/R0/K2/P0/X1] in 15 ... (Hash=2044MB)
AutoTurbo-Suche nach Spezial-Matt [C0/R0/K2/P0/X2] in 15 ... (Hash=2044MB)
AutoTurbo-Suche nach Spezial-Matt [C0/R0/K2/P0/X3] in 15 ... (Hash=2044MB)
AutoTurbo-Suche nach Spezial-Matt [C0/R0/K2/P0/X4] in 15 ... (Hash=2044MB)
AutoTurbo-Suche nach Spezial-Matt [C0/R0/K2/P1/X4] in 15 ... (Hash=2044MB)
Matt in 15 gefunden ! (1 Lösung in 00:00)
15/15 0:00 +M15 1.Lc5 Kc1 2.Lxe3+ Kb1 3.Lh6 c5 4.Kg5 Kc1 5.Kh5+ Kb1 6.g5 Kc1 7.g6+ Kb1 8.Tf4 Kc1 9.Tg4+ Kb1 10.f4 Kc1 11.f5+ Kb1 12.Tf4 Kc1 13.Tff1+ Kb1 14.Txd1+ 4062
Bester Zug: Lf8-c5 Zeit: 0:00.813 min K/s: 4.062.600 Knoten: 243.756
But the "secret" here seems to be AutoTurbo, which I hadn't tried before, in this mode with other one kinds of SeachOrder: still under 1 minute at KPX and again almost at once with KXP.
Edit: of course there do exist best settings for Gustav too to make it solve as well as at once:
Steve Maughan wrote: ↑Tue Dec 16, 2025 9:51 am
The development version of Juggernaut, running on my AMD laptop with eight cores, finds a mate in 19 after 33 secs. Not too bad.
I am pleased that it picked Rd7 as the first move, because that's actually the first move I came up with looking at it visually!
Human chess is partly about tactics and strategy, but mostly about memory
setoption name Hash value 2048
setoption name ProofNumberSearch value true
position fen 8/5R2/2p3K1/8/2P1P1PP/1p1BBPP1/prp1p3/bk1bR3 w - - 0 1
go mate 13
info string Starting Proof-Number Search ...
info time 572 multipv 1 depth 8 seldepth 25 nodes 1586752 nps 2774041 hashfull 0 tbhits 0 score cp 0 pv e3h6
info time 772 multipv 1 depth 12 seldepth 25 nodes 3097305 nps 4012053 hashfull 0 tbhits 0 score cp 0 pv e3h6
info time 972 multipv 1 depth 12 seldepth 25 nodes 4673861 nps 4808498 hashfull 0 tbhits 0 score cp 0 pv e3h6
info time 1172 multipv 1 depth 12 seldepth 25 nodes 6246886 nps 5330107 hashfull 0 tbhits 0 score cp 0 pv e3h6
info time 1372 multipv 1 depth 12 seldepth 25 nodes 7833956 nps 5709880 hashfull 0 tbhits 0 score cp 0 pv e3h6
info time 1572 multipv 1 depth 12 seldepth 25 nodes 9425133 nps 5995631 hashfull 0 tbhits 0 score cp 0 pv e3h6
info time 1772 multipv 1 depth 12 seldepth 25 nodes 11016562 nps 6217021 hashfull 0 tbhits 0 score cp 0 pv e3h6
info time 1972 multipv 1 depth 13 seldepth 25 nodes 12550701 nps 6364452 hashfull 0 tbhits 0 score cp 0 pv e3h6
info string Nodes statistics: Total 5876393 Solved 307802 Proven 66 Disproven 307736 Recycled 138993
info string Success! Mate in 13 found!
info time 2376 multipv 1 depth 13 seldepth 25 nodes 15609465 nps 6569640 hashfull 0 tbhits 0 score mate 13 pv e3h6 c6c5 g6g5 b1c1 g5h5 c1b1 g4g5 b1c1 g5g6 c1b1 f7f4 b1c1 f4g4 c1b1 f3f4 b1c1 f4f5 c1b1 g4f4 b1c1 f4f1 c1b1 e1d1 e2d1n f1d1
bestmove e3h6 ponder c6c5
Great performance.
Even with my last one version compiled by Jim Ablett way back then about 1.5 years ago, and at original starting position of the composed puzzle, if I set KingMoves to 1:
Ajedrecista wrote: ↑Mon Dec 15, 2025 8:08 pm
Hello Andrew:
Chest 5.2 with K1/P1/X1 parameters was not able to find a checkmate in 13 moves from the position of the OP. Surprisingly, I randomly found some parameters that worked for Chest!
I see that some people found working parameters for Chest while I was writing, so this is a kind of shared, independent solutions. My parameters are with default KXP SearchOrder; the solving time was less than 1 second using 64 MB of hash in a CPU of year 2010 if I am not wrong.
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Thank you for the source. I replayed the solution at PDB and my head is still burning... wow!
Phénix site has links to many issues, including the one given in PDB:
The study is the No. 9181 at page 12681 and solution in French at page 12692. The author noted that the key ideas are the same than in other problems, for example one of his own:
The study No. 8889 at page 12168 and solution in French at page 12181. The author noted that No. 8889 was an Indian theme linked with Herlin, Zabunov and Klasinc themes, where each of the last three is explained in the solution. Chest 5.2 succeeded again with K2/P3/X4 parameters:
I beg your forgiveness for taking so long to get back to you, I've been quite busy lately , I truly appreciate your commentary on these problems I sometimes post, and I DEFINTELY appreciate how you are able to dig up the sources and give more information on the problem, I ALWAYS check the links you supply and of course look at other goodies that are in the sources you supply.
, I truly appreciate your commentary on these problems I sometimes post, and I DEFINTELY appreciate how you are able to dig up the sources and give more information on the problem, I ALWAYS check the links you supply and of course look at other goodies that are in the sources you supply.