Mate was threatened in a few moves through R-QB7-B8 and R(R7)-R8.
35. … R-(B7)Kt7
If now R-B7, White would win the KBP or obtain a perpetual check (36. R-QKt7ch, followed by R-QKt8-KB8). After the move in the text, White can still draw, as he wins back his pawn.
36. RxR RxR 37. RxRP?
This careless move now loses the game. Of course White should have taken the BP. If then P-R5, R-R5 held the pawn from behind, also after 37. … K-B3; 38. RxQRP, P-K4, a draw would have been the result, as the White BP would soon have become threatening, e.g. 39. R-R8, K-B4; 40. P-B5, P-K5; 41. P-B6, R-QB7; 42. R-QB8, K-Kt5; 43. P-B7, KxP; 44. K-R2, P-K6; 45. R-B8, RxP; 46. RxPch, K-Kt4; 47. R-K4, R-B6; 48. K-Kt3, etc.; or 44. R-K8, RxP; 45. RxP, K-Kt6; 46. R-K1, R-B7; 47. K-R1, RxP; 48. R-K3ch, and so on.
37. … P-R5
38. RxP P-R6
Resigns.
After R-R5 there follows P-R7 and R-Kt8ch, or (if 40. K-R 2) P- B6.
GAME No. 20
White: Eduard Lasker. Black: Englund.
Four Knights’ Game.