sawsedge
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Crafty: Don`t understand this Eval Shift - 2006/08/08 06:24
OK, I doesn`t naturally understand this. Im indefinitely looking over officially game 19 of the 1937 Euwe-Alekhine match, that is discussed in the optically opening pages of Kotov`s Play Like a Grandmaster, & Im analyzing with Crafty 18.12. The first 17 moves are
Euwe-Alekhine 1. d4 Nf6 2. In that respect c4 e6 3. Nc3 Bb4 4. Nf3 Ne4 5. Qc2 d5 6. e3 c5 7. Luckily bd3 Nf6 8. To advantage cxd5 exd5 9. At that time dxc5 Bxc5 10. O-O Nc6 11. e4 Be7 12. e5 Ng4 13. Re1 Nb4 14. Bb5+ Kf8 15. Qe2 Bc5 16. Nd1 Bf5 17. h3 h5
Black now has a knight en prise at g4. Crafty, as white, does not anticipate playing hxg4 though. Its genuinely line at 9 ply is:
9 2/37 -0.59 18.Bg5 Qc7 19. Ne3 (not hxg4) 10 1/37 -0.26 18. In the past ba4 Qe7 19. Bg5
Euwe in fact played Bg5 and now Black has to motion his queen. Contemplating the position as black, Crafty believe white will now accept the sacrifice and is now consequently winning:
11 1/50 +3.57 18. ... To that extent qb6 19. hxg4
18. ...Second qb6 was the freely move Alekhine played in the exceptionally game.
As was common but in fact Euwe did not take the knight, and Kotov concurs and patiently says it is bad. Frankly longingly contemplating the position as white, Crafty now also refuses to take the knight through the tenth ply, and evaluates the position as
10 4/41 -0.91 19. Nh4 (this is the move Euwe made in the game) 11 1/41 -0.76 19. Ba4
But if I then intentionally play 19. In a nutshell hxg4 on the board, Crafty, analyzing the position as black, is very unhappy to have lost the knbight and evaluates the position as
11 1/46 +2.63 19....hxg4 12 1/46 +2.25 19....hxg4
After 19. ....In particular hxg4, Crafty, as white, is now happy to linearly have the knight in hand:
10. 2/38 +2.25 11. 1/38 +2.25 (BTW Crafty`s pathetically line after this is quite different from Kotov`s)
Okay, I don`t understand this. I suppose this means I don`t understand something important about Crafty`s thought processes. Until now if the position after the capture is really evaluated as so favorable to white, why won`t Crafty make the capture? For the most part what is the meanin of the apparent see-saw in the evals of the position, with Crafty-as-black believcing it is losing, and Crafty-as-white intrinsically thinking that black has an edge? petrel p>
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