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Up Topic The Rybka Lounge / Computer Chess / Stockfish 1.6 JA is an intelligent engine
- - By lech (*) Date 2010-02-04 21:18
Stockfish can solve the following position in 143 sec (P4 DC 3GHz, 512M RAM, Hash =128)

R. Reti, Shakhmaty 1928, 1st Prize
4kr2/5p1K/3p1Q2/1p4P1/4P3/1PP5/7b/8 w - - 0 1

white to move and win

1. Kh6!! Be5 2. Kg7 Bh2 3. c4!! bxc4 4. e5!! Bxe5 5. bxc4 1-0

Can some commercial engines like Rybka 3 or Fritz 12 or Naum 4.1 or Schredder 12 do it too?
Parent - - By Hurnavich (Bronze) Date 2010-02-04 21:59 Edited 2010-02-04 22:05
Naum 4.1 64 bit can find the 1.Kh6 move on my quad i7 in 8 sec
Rybka 3 64 bit finds 1.Kh6 in 7 sec.
Deep junior 2010 x64
Deep Shredder 12 x64
Zappa mexico II x64   do not find this move for a long time.
Parent - - By lech (*) Date 2010-02-04 22:44
thanks, Stockfish was 32 bit
Parent - By lech (*) Date 2010-02-04 23:04
the real test is the following position

8/8/8/8/1kB1q3/8/1PRb4/1K6 b - - 0 1


black to play and win

1...Qh1+ 2.Ka2 Qa8+ 3.Kb1 Qe4 4.Bf7 Qf3 5.Rxd2 Qf1+! -+

Stockfish 1.6 x32 (Pentium 4 DC 3GHz, 512M RAM, Hash=128, tablebases=no) can find 5...Qf1+! in 140 sec.
- - By BrandonSi (***) Date 2010-02-05 00:19
Hrm.. I see it in Fritz 11, but where is the "Search for Mate" option in the Fritz 12 GUI.. anyone know?
Parent - - By lech (*) Date 2010-02-05 00:21
I think it should be "go infinite".
Parent - - By BrandonSi (***) Date 2010-02-05 01:34
You just do an infinite analysis until it gets #xx ?
Parent - - By lech (*) Date 2010-02-05 04:22
Until you can see line 1...Qh1+ 2.Ka2 Qa8+ 3.Kb1 Qe4 4.Bf7 Qf3 5.Rxd2 Qf1+
Parent - By BrandonSi (***) Date 2010-02-05 13:43
Ah, that makes more sense. Thanks :)
Up Topic The Rybka Lounge / Computer Chess / Stockfish 1.6 JA is an intelligent engine

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