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42. Rge7
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White must stop Be6 without giving Black any other tactics. |
 
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42... Kg6
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White's rooks are stuck supporting each other, the queen and king are powerfully placed to stop attacks from the rooks, so there really isn't anything White can do at this point. White's king is stalemated, so all Black needs to do is get in a bishop check, such as a Bd3-Bc4 maneuver. |
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43. Re5e1
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All White can do is maneuver the rook along the e-file and threaten the annoying Rg1 which makes it so that Black has to spend many extra moves recoordinating his pieces. |
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43... Bg4
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White's e7 rook is stuck defending against Qg7# and blocking Qd8 , so White can only move his other rook. All Black needs is one bishop check to win, but first he needs to block rook checks and limit White's options. |
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44. Re1e3
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After R1e5, Bf3 threatens Bd5 and the bishop is invincible since the rooks have to defend each other. After R1e4, Bd1 threatens Bb3 and once again, the bishop is invincible since one rook defends against Qg7# while the other rook defends against Qxe7, Black will win a rook if White takes the bishop.
The text move doesn't allow the bishop check maneuver since it threatens Rg3 if the bishop moves. |
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44... Qd4
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Black's superior attacking forces have proven too much for White's pieces to handle. Having a queen and minor piece for 2 rooks is usually a crushing advantage and the rooks will end up defenseless. White's rooks are stuck on the e-file, because if White only has 1 rook on the e-file, then Qd8 will be mate. The e7-rook is still stuck defending against Qg7#, so moving the e3-rook along the e-file is all White can do. Kf8 loses to Qh8# |
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45. Re3e5
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If 45.Re1 or 45.R3e4, then 45...Qd5 46.Kf8 (or h8) Qd8 47.Re8 Qf6 48.Kg8 Qg7#
White's defensive options are quickly slimming down, which is what happens in a lot of pawnless chess endings. The superior pieces have more move options and better coordination, while the weaker pieces are struggling just to find 1 defensive resource. When the weaker side runs out of moves, they often find themself in zugswang. There are a lot of zugswang tactics in pawnless endgames. |
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45... Qd8+ 46. Re7e8 Qd6
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White's rooks are running out of defensive power. White can only move his e5 rook because if R8e7, then Qb8 Re8 Qb3 Kh8 (Kf8 Qf7#) Qh3 Kg8 Qh7 Kf8 Qf7#
White should defend the 7th rank with the e5-rook since other moves along the e-file allow Qd5 Kh8 (Kf8 Qf7#) Qh5 Kg8 Qh7 Kf8 Qf7# |
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47. Re5e7 Qf6
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This is similar to the positions after move 41, where Black is trying to get in a bishop check, except now White's rooks are forced to defend, unlike after move 41, where White's rooks can be disruptive. White has nothing, because the e8-rook must support the e7-rook, and the e7-rook is defending Qg7#, White's e7-rook can only move along the 7th rank, allowing Be6 so Black's win is clear now. The superior attacking pieces have forced zugswang so that the defenders are forced to disrupt the defense. |
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48. Ra7
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I will compare the continuation with positions where White's rook is on c7 or b7 |
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48... Be6+
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The long awaited bishop check has finally come in, and Black has won the exchange, going into a simpler ending. |
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49. Rxe6 Qxe6+ 50. Kf8
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Kh8 loses to Qe8#, so now all Black needs to do is come up with a tactic to win the rook. Queen vs. rook is always a win, but most positions are more complicated where the queen has to use technique to force the king away from the rook, and then the queen can win the rook with a forking tactic. If the rook was on b7 here, then the queen wins the rook with Qc8 .
If The rook was on c7 here, then the queen wins the rook with Qd6 Re7 Kf6.
There is almost always a rook winning tactic in queen vs. rook when the king and rook are not supporting each other. |
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50... Kf6
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Black can win the rook with Qc8 Ke7 Qc5 fork, but if you want to be more accurate, this move mates faster by forcing the rook to a square where it can be won on the 7th rank, so that Black's queen is already in a mating position. Black has forced mate in 3 moves. |
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51. Rc7 Qd6+ 52. Ke8 Qxc7 53. Kf8 Qf7#
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Endgames without pawns are purely tactical and you must have good tactics in order to play them correctly. Black started with only a 2-point material advantage, but ended up forcibly winning both rooks for only the bishop, because of the tactics the stronger attacking units were able to unleash upon the weaker defensive units. |
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