A Combination

[YL84]

Hi,
An other nice combination (Milady2.2x-TSCP 1.81). First move easy to find

[d] 1r2k2r/pppb1p1p/6p1/4P1q1/4p3/BQP1P3/P4PPP/R2R2K1 w k - 2 18

Yves

[Mike S.]

Analysis by Chess Tiger 14.0 (D945 3.4 GHz, 192 MB hash):

18.Rxd7 Rf8 19.Rxf7
+- (13.16) Depth: 8 00:00:00 267kN
+- (#9) Depth: 11 00:00:08 6250kN

18.Rxd7 Kxd7 19.Qxf7+ Kc6 (19...Kc8 20.Qe6+ Kd8 21.Rd1#) 20.Qc4+ Kd7 21.Rd1+ Ke8 22.Qe6+ Qe7 23.Qxe7# 1-0

Of course, other moves than 18...Kxd7 only make sense to delay the mate. ChestUCI gives this variation (#7):

18.Rxd7 Rf8 19.Rxc7 a6 20.Qa4+ b5 21.Qb4 Rg8 22.Qd6 Qxg2+ 23.Kxg2 h6 24.Qe7# 1-0

[Roman Hartmann]

Roce seems to have no problem with this position. But, of course, Roce has troubles to reach positions like that ...

Code: Select all

roce: setboard 1r2k2r/pppb1p1p/6p1/4P1q1/4p3/BQP1P3/P4PPP/R2R2K1 w k - 2 18

roce: analyze

 D.   Time    Score  Best line
  1   0.00    0.58   Ba3-c5 
  2   0.00    0.93   Qb3-d5 bd7-f5 
  3   0.04    0.60   Ba3-c5 qg5xe5 Bc5xa7 
  4   0.06    1.15   Ba3-c5 a7-a5 Qb3-d5 bd7-c6 
  5   0.28    1.00   Qb3-d5 bd7-a4 Rd1-f1 ba4-c6 Qd5-d4 
  6   0.76    7.30   Rd1xd7 rh8-f8 Ba3xf8 qg5-f5 Rd7xc7 ke8xf8 
  7   2.54    7.61   Rd1xd7 rh8-f8 Rd7xc7 qg5xe5 Qb3-a4+ b7-b5 Qa4xa7 
                     rb8-d8 
  8  11.31   10.81   Rd1xd7 rh8-f8 Rd7xf7 rf8xf7 Qb3-e6+ qg5-e7 Ba3xe7 
                     rf7-g7 Be7-f6+ ke8-f8 
  9   1:00   13.97   Rd1xd7 rh8-f8 Rd7xf7 rf8xf7 Qb3-e6+ qg5-e7 Ba3xe7 
                     c7-c6 Be7-c5+ ke8-d8 Ra1-d1+ kd8-c7 
 10   2:47    +M07   Rd1xd7 ke8xd7 Qb3xf7+ qg5-e7 Qf7xe7+ kd7-c6 Qe7-c5+ 
                     kc6-d7 Qc5-d5+ kd7-c8 Qd5-e6+ kc8-d8 Ra1-d1# 
 11   7:29    +M07   Rd1xd7 ke8xd7 Qb3xf7+ qg5-e7 Qf7xe7+ kd7-c6 Qe7-c5+ 
                     kc6-d7 Qc5-d5+ kd7-c8 Qd5-e6+ kc8-d8 Ra1-d1# 

[YL84]

To reach this position is difficult. White played Ba3 early in the game, preventing black castle. Last black move (Qg5) could be considered as a blunder (it's a 10 min game, TSCP looks at depth 6 maximum on my pIII 450Mhz), but it is not easy to play something useful for black. The low search depth of TSCP prevented him to see the Rxd7 reply.
Yves