5

In the below position, what is a clear line that shows Black escapes from perpetual check?

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  • I only see lines where black "escapes" from perpetual check by running into a helpmate (e.g., on h8 or on h5). Needless to say, that perpetual check is the better choice for black. – jknappen Apr 24 '18 at 16:04
  • @jknappen this is a CT solution to a puzzle. – Jossie Calderon Apr 25 '18 at 4:36
6

It seems that the black king can escape via a5:

1...Kb8 2.Qd6+ Kb7 3.Qd7+ Kb6 4.Qd8+ Kb5 5.Qb8+ Ka5 [not Kc5 6.Qd6 Kd4?? 7.Qxb4] 6.Qc7+ Rb6 7.Qc5+ Rb5 8.Qc7+ Kb4 and you go for the hills.

edit: 5.a4+!, noticed by @jknappen, is problematic. The right solution is rather to bring the king to a7 before covering checks with ...Rb7, as in @InertialIgnorance 's answer which should become the accepted one.

  • and what happens after 5. a4+ guarding the field b5 with the pawn? Will black win with a rook sacrifice? – jknappen Apr 25 '18 at 13:25
  • @jknappen : uuum, good remark. Giving back the rook is, to say the least, too complicated for the final position of a CT exercise. I've to spend more time on the position tonight, maybe Kb6-a7 and bringing down the rook to b6/b7 is rather the way to go. – Evargalo Apr 25 '18 at 13:56
  • @jknappen As Evargalo said, Black needs to move the King back down. Komodo says Black is still winning after 5...Kc6, but there's a lot of work to do. – Inertial Ignorance Apr 25 '18 at 20:47
  • @jknappen The mate threat of ...Qh1+ and Qh5# is looming, so if Black plays Rb5 he can escape to b4. – Jossie Calderon Apr 25 '18 at 21:25
5

To escape from perpetual check when up material in an endgame, a good strategy is to try to surround your King with your extra pieces. In this case, that would be your Queen and Rook, and maybe a few of your pawns. Sample line:

1...Kb8 2. Qd6+ Ka7 3. Qc7+ Rb7 4. Qc5+ Kb8 and now White has a few options:

a) 5. Qd6+ Kc8 6. Qc6+ Rc7 (7. Qe8+ Kb7) 7. Qa8+ Kd7 and Black escapes.

b) 5. Qf8+ Kc7 6. Qe7+ (6. Qd6+ Kc8 transposes to line a) Kb6 7. Qd6+ Kb5!! 8. a4+ Ka5 9. Qc5+ Rb5!! and Black wins. White cannot take Rb5 with the a-pawn due to the threat of Qh1#

I found all the moves myself up until move 7 in line b). Komodo came up with the brilliant idea of 7...Kb5, 8...Ka5, and 9...Rb5

  • +1. I don't need to correct my answer anymore since you show the right variation. – Evargalo Apr 26 '18 at 9:19
  • @Evargalo From a practical standpoint, I think your answer still has merit. If White doesn't find 5. a4+, then the game is won quicker. If White does find the move, Black is still winning but it will take a while to prove. Objectively 2...Kb7 isn't best, but in a situation such as time trouble over the board it's perfectly valid. – Inertial Ignorance Apr 26 '18 at 9:30

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