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Subject: a mistake in ecmgcp

Author: Uri Blass

Date: 23:57:54 12/12/05


The right move in ECM1527 is supposed to be 1.h3
Unfortunately it seems that 1.Qh6 Nxd4 2.Nd5 is also winning as both movei and
Rybka find.

I give here only analysis of rybka(A3000 512 mbytes hash)

New game,
[D]2r2rk1/pp2pp1p/2np2p1/q4P2/2PBP1b1/2N5/PP1Q2PP/R4RK1 w - - 0 1

Analysis by Rybka 1.0 Beta 32-bit:

1.fxg6
  =  (-0.16)   Depth: 3   00:00:00
1.fxg6
  =  (0.05)   Depth: 4   00:00:00
1.fxg6 fxg6
  =  (-0.17)   Depth: 5   00:00:00
1.f6 Nxd4
  =  (0.01)   Depth: 5   00:00:00
1.f6 Nxd4 2.Qxd4 e5
  ²  (0.48)   Depth: 6   00:00:00  12kN
1.f6 Nxd4 2.Qxd4 e5 3.Qd2
  ²  (0.46)   Depth: 7   00:00:00  20kN
1.f6 Nxd4 2.Qxd4 e5 3.Qd2 Kh8
  ²  (0.46)   Depth: 8   00:00:00  44kN
1.h3 Nxd4 2.Qxd4 e5 3.Qd2 Bxh3
  +-  (1.64)   Depth: 8   00:00:01  71kN
1.h3 Nxd4 2.Qxd4 e5 3.Qd2 Bxh3 4.gxh3 Rxc4
  +-  (1.67)   Depth: 9   00:00:01  100kN
1.h3 Nxd4 2.Qxd4 e5 3.Qd2 Bh5 4.g4 Bxg4
  +-  (1.78)   Depth: 10   00:00:03  174kN
1.h3 Be2 2.b4 Qxb4 3.Rab1 Qxc4 4.Nxe2 Qa6
  +-  (2.09)   Depth: 11   00:00:07  417kN
1.h3 Be2 2.b4 Qxb4 3.Rab1 Qxc4 4.Nxe2 Qa6 5.fxg6
  +-  (2.11)   Depth: 12   00:00:11  644kN
1.h3 Be2 2.b4 Qxb4 3.Rab1 Qxc4 4.Nxe2 Qa6 5.fxg6 hxg6
  +-  (2.08)   Depth: 13   00:00:19  1180kN
1.h3 Be2 2.b4 Qxb4 3.Rab1 Qxc4 4.Nxe2 Qa6 5.Rfc1 b6
  +-  (2.15)   Depth: 14   00:00:42  2814kN
1.h3 Be2 2.b4 Qxb4 3.Rab1 Qxc4 4.Nxe2 Qa6 5.Bc3 b6
  +-  (2.16)   Depth: 15   00:01:24  5697kN
1.h3 Be2 2.b4 Qxb4 3.Rab1 Qa5 4.Rb5 Qa6 5.Nxe2 Nxd4
  +-  (2.03)   Depth: 16   00:02:33  10365kN
1.Qh6 Nxd4 2.Nd5 Qd8 3.f6 exf6 4.Nxf6+ Qxf6 5.Rxf6 Rxc4
  +-  (2.37)   Depth: 16   00:08:18  33469kN
1.Qh6 Nxd4 2.Nd5 Qd8 3.f6 exf6 4.Nxf6+ Qxf6 5.Rxf6 Rxc4
  +-  (2.28)   Depth: 17   00:13:04  53589kN

(,  13.12.2005)



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