Shredder – CT800

This is a game between Shredder Mobile on Nokia 6303i and the CT800, both at 20 seconds per move.

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[White "Shredder Mobile"]
[Black "CT800"]
[Opening "Sicilian Opening"]
[WhiteElo "?"]
[BlackElo "2100"]
[Date "2016.08.21"]
[Result "0-1"]
[TimeControl "1/20"]

1. e4 c5 {Sicilian Opening.} 2. Nf3 d6 3. d4 cxd4 4. Nxd4
Nf6 5. Nc3 Bd7 6. Be3 g6 7. Bc4 Bg7 8. O-O O-O 9. Qd2 Nc6
10. Nxc6 Bxc6 11. f3 Rc8 12. Bxa7 {That pawn is poisoned.}
Bd7 13. b3 b6 14. Qe3 Rc5 15. a4 Qc7 16. Nb5 Bxb5 17. axb5
Nd7 18. c3 Ra8 19. Bxb6 Nxb6 {That was the poison in the pawn.}
20. Rxa8+ Nxa8 21. Ra1 Nb6 22. g4 e5 {Why closing off the bishop?!}
23. Kg2 Nxc4 24. bxc4 Rxc4 {That is a blunder – Qc7-b8 was
fine, guarding the back rank.} 25. Ra8+ Bf8 26. Ra3 {The
counter-blunder! Qe3-h6 was the move.} d5 27. Rb3 Qa5 28. Qe2
Qa4 29. Qc2 dxe4 30. fxe4 Rxe4 31. h3 Re3 32. Rb2 Qa8+ 33. Kg1
Rxh3 34. Qg2 Bc5+ 35. Rf2 Qa1+ {The CT800 announces mate in 7.}
36. Qf1 Bxf2+ 37. Kg2 Rh2+ 38. Kf3 Qxc3+ 39. Ke2 Bg3+ 40. Qf2
Rxf2+ 41. Kd1 Qa1# {Checkmate.} 0-1
    Shredder Mobile vs. CT800

1.   e2-e4   c7-c5 (Sicilian Opening)
2.  Ng1-f3   d7-d6
3.   d2-d4   c5xd4
4.  Nf3xd4  Ng8-f6
5.  Nb1-c3  Bc8-d7
6.  Bc1-e3   g7-g6
7.  Bf1-c4  Bf8-g7
8.     0-0     0-0
9.  Qd1-d2  Nb8-c6
10. Nd4xc6  Bd7xc6
11.  f2-f3  Ra8-c8
12. Be3xa7   ...   (That pawn is poisoned.)
12.  ...    Bc6-d7
13.  b2-b3   b7-b6
14. Qd2-e3  Rc8-c5
15.  a2-a4  Qd8-c7
16. Nc3-b5  Bd7xb5
17.  a4xb5  Nf6-d7
18.  c2-c3  Rf8-a8
19. Ba7xb6  Nd7xb6 (That was the poison in the pawn.)
20. Ra1xa8+ Nb6xa8
21. Rf1-a1  Na8-b6
22.  g2-g4   e7-e5 (Why closing off the bishop?!)
23. Kg1-g2  Nb6xc4
24.  b3xc4  Rc5xc4 (Blunder! Qc7-c8 to guard the back rank.
                    In analysis mode, the CT800 comes up with
                    Qc7-b8 after 185s.)
25. Ra1-a8+ Bg7-f8
26. Ra8-a3   d6-d5
27. Ra3-b3   ...   (The counter-blunder. Qe3-h6 would have
                    turned the game, probably even winning.)
28. ...     Qc7-a5
28. Qe3-e2  Qa5-a4
29. Qe2-c2   d5xe4
30.  f3xe4  Rc4xe4
31.  h2-h3  Re4-e3
32. Rb3-b2  Qa4-a8+
33. Kg2-g1  Re3xh3
34. Qc2-g2  Bf8-c5+
35. Rb2-f2  Qa8-a1+ (The CT800 announces mate in 7.)
36. Qg2-f1  Bc5xf2+
37. Kg1-g2  Rh3-h2+
38. Kg2-f3  Qa1xc3+
39. Kf3-e2  Bf2-g3+
40. Qf1-f2  Rh2xf2+
41. Ke2-d1  Qc3-a1#

Here is the game in PGN notation.

It begins as a bread-and-butter Sicilian Opening until the CT800 offers a poisoned pawn, the classic “trapped bishop on a7” move. Shredder Mobile takes the bait, and they have an argument about whether the bishop is actually being trapped or not.

Neither of them was able to calculate this through in advance. It is just that the CT800 knows about trapped bishops and Shredder Mobile does not. Finally, Shredder Mobile has to agree that the bishop has no future, and the CT800 wins the bishop for two pawns.

The CT800 continues its attack on the queenside, targeting the pawns before they become dangerous. Then the CT800 blunders, taking one of the pawns too early instead of guarding the back rank first.

In analysis mode, the CT800 keeps the weak move until depth 9 is reached, which takes 185 seconds. Only then it sees the necessity to guard the back rank.

Shredder Mobile has the opportunity to turn the odds and probably even win the game. However, Shredder Mobile counter-blunders and retreats the rook instead of getting the queen to the black king.

From then on, the CT800 wins the game, announcing “mate in 7” by the 35th move.