Hello Vas,

here is a position, created by W. Eigenmann (2005)

1....Kh4 (Black will win)



Analysis by Rybka 2.3.1 mp 64-bit on Windows XP-64 (F10-GUI):

1...Kf6 2.Bc2 Ke6 3.Bd1 Bf2 4.Bg4+ Kd6 5.Bd1 Bh4 6.Kf5 Be1 7.Ke4 Bf2 8.Bc2
  ³  (-0.67)   Tiefe: 2   00:00:00
  µ  (-0.74)   Tiefe: 37   00:00:44  14420kN, tb=3154

Further analysing had no progress after the above evaluation. I stopped evaluation after 1 hour.

The evaluation so far was 1....Kh4 (10/12)
-/+ (-0.74); Depth: 37; time: 00:00:44; 14420KN; tb=3154

It seems Rybka hangs somewhere in a loop. Please can you check this behavior?.

The correct solution (German notation) is:

1...Kh4! [1...Kf6? 2.La4 Ke6 3.Lb3 Kd6 4.La4 Kc7 5.Lb3 Kb6 6.La4 a6 7.bxa6 Kxa6 8.Lb3=] 2.Kf3 [2.Lc2 Kg3 3.Ld1 Kf2 4.Kd3 Ke1 5.La4 e4+ 6.Kxe4 Kd2-+] 2...Kh3 3.Lc2 [3.Lb3 Kh2-+; 3.Ke4 Kg3-+; 3.La4 Kh2-+] 3...Kh2 4.Le4 [4.Ld1 Kg1 5.Ke2 (5.Ke4 Kf2-+) 5...Kg2 6.Lb3 a) 6.Lc2 Kg3-+; b) 6.Kd3 Kf2 7.Lc2 (7.Ke4 Ke1 8.Lb3 Kd2-+) 7...Kf3 8.Ld1+ Kf4-+; 6...Kg3 7.Lc2 (7.La2 Kf4 8.Lb1 e4-+) 7...Kf4-+; 4.La4 Kg1 5.Ke2 Kg2-+; 4.Lb1 a4-+; 4.Ke4 Kg2-+] 4...a4 5.Ke2 [5.Lb1 a3 6.La2 Kg1-+] 5...Kg3 6.Lc2 [6.Lb1 a3 7.La2 (7.Kd3 Kf2-+) 7...e4-+] 6...a3 7.Lb1 Kf4 8.La2 e4-+ (W.Eigenmann)

Here is the result testet with Rybka 2.2n2 mp:

Neue Partie - Rybka 2.3.1 mp

Analysis by Rybka 2.2n2 mp :

1...Kf6 2.Lc2 Ke6 3.Lb3 Lb2 4.Ld1 Lc1 5.Lc2 Lf4 6.La4 Ld2 7.Lb3 Kd6 8.Ld1
  ³  (-0.52)   Tiefe: 2   00:00:00
  ³  (-0.66)   Tiefe: 23   00:00:26  7012kN
1...Kh4 2.Kf3 Kh3 3.Lc2 Kh2 4.Ld1 Kg1 5.Ke4 Kf1 6.Kd3 Kf2 7.Lc2 Kf3 8.Ld1+
  µ  (-1.03)   Tiefe: 23   00:00:39  11927kN
  µ  (-1.03)   Tiefe: 26   00:01:24  25606kN

Volker.