|Pawn and Two: This game was closely contested for many moves. At move 25, Fritz indicated the game was about equal: (-.09) (20 ply) 25.a4.|
Instead of 25.a4, and an equal position, Bogoljubov played 25.Nxe5. Even this continuation gave Alekhine only a minimal edge: (-.26) (20 ply) 25.Nxe5 Qxe5 26.Bc4 Bxc4 27.Qxc4 Qb2 28.a4 Rxd1+ 29.Rxd1 Qb4 30.Rc1.
On his 30th move, Bogoljubov made a slight error: (-.62) (20 ply) 30.Qc2. Then another slight error followed at move 31, when instead of: (-.62) (20 ply) 31.Rb1, he played: (-.74) (20 ply) 31.Ne2.
On his 33rd and 34th moves, Bogoljubov clearly stepped over the edge, with a resulting lost position.
First at move 33, instead of: (-.78) (22 ply) 33.Rd7, Bogojubov played: (-1.10) (22 ply) 33.Rb1 Qa5, and then instead of: (-1.00) (21 ply) 34.Rd1, he played: (-1.54) (21 ply) 34.Kg2?.
Due to a succession of errors by his opponent, Alekhine had a won position at his 34th move.
The position after 34.Kg2?:
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In this positon, Alekhine could have won by: (-1.53) (21 ply) 34...Rc4! 35.Ra1 Rb4! 36.Nd4 Bxd4 37.exd4 Rxd4 38.Rc1 Rxa4 39.Qxc3 Qxb5.
Instead of continuing with the winning 34...Rc4!, Alekhine made a series of errors, which turned his winning position, into a lost position!
First at move 34, Alekhine played: (-.64) (21 ply) 34...Rd8?, which gave up much of his advantage.
Then on his next move, instead of: (-.72) (20 ply) 35...Qc7, Alekhine made a slight error with: (-.39) (20 ply) 35...Rd2 36.Qa8+.
After 36.Qc4, Alekhine could have continued: (-.54) (21 ply) 36...Qd8. Instead, he slipped again with: (.16) (21 ply) 36...Rc2? 37.Rd1.
Finally, at move 37, instead of: (.19) (21 ply) 37...Rd2, with an approximately equal position, Alekhine played 37...Qb6??, and he then had a losing position!
Alekhine, with his series of errors, had returned the favor to Bogoljubov!
The position after 37...Qb6??:
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In this position, Bogoljubov had a winning continuation with: (1.44) (25 ply) 38.Rd7! Rb2, (1.61) (23 ply) 39.Qc8+ Kh7 40.Nd4 Bxd4 41.exd4 c2 42.Qc3 Ra2 43.Rxf7, (1.39) (24 ply) 43...e5 44.dxe5 Qe6 45.Rc7 Qd5+ 46.Qf3 Qxf3+ 47.Kxf3 Kg6, (2.01) ( 24 ply) 48.Ke3 Kf5 49.Kd2 Rxa4 50.Rxg7 Kxe5 51.Rh7 Rc4 52.Kc1 Ke4 53.Rxh6 Rc7, (3.02) (23 ply) 54.b6 axb6 55.Rxb6, or (3.07) (23 ply) 54.Ra6 Kd4 55.b6 axb6 56.Rxb6, with a winning position for White.