Kolbus, Dietmar 2303–Van Foreest, Jorden 2461 chessposition

[Maharadja]

This is a position during NK open between Kolbus, Dietmar 2303–Van Foreest, Jorden 2461

2b4r/1p3kb1/3p1nq1/P1pPp1p1/P1P1PpPn/1NN2P2/2KBB3/5RQ1 b - - 0 30

The comment on chessbase:

[Event "NK Open, Dieren"]
[Site "?"]
[Date "2014.07.24"]
[Round "3"]
[White "Kolbus, Dietmar"]
[Black "Van Foreest, Jorden"]
[Result "0-1"]
[WhiteElo "2303"]
[BlackElo "2461"]
[SetUp "1"]
[FEN "2b4r/1p3kb1/3p1nq1/P1pPp1p1/P1P1PpPn/1NN2P2/2KBB3/5RQ1 b - - 0 30"]
[PlyCount "7"]
[EventDate "2014.??.??"]

{What would you play with Black?} 30... Nxf3 $3 {I gave two exclamation marks
to this daring and honestly speaking, extraordinary positional sacrifice,
since I believe it simple deserves it. It is not the first time I am
mentioning the refreshing chess the young Jorden is playing; the point he
received in this game is the guerdon of his no-half-measure treatments. And of
course, of his excellent play. In the game} 31. Bxf3 {followed, which was
answered with} Rh3 32. Qg2 Rg3 33. Qh1 Nxg4 {where Black grabbed a pawn, then
another and after 30 more moves, the game.} 0-1


If the move Nxf3 only draws then it would already deserve 2 !! because the engines here favour white.
But if this is really winning then we can add 2 more !! for this move.
The first critical move is I believe 33 Qh1, my SF prefers 33 Qe2 but fails also low after some thinking.

[zullil]

This is a position during NK open between Kolbus, Dietmar 2303–Van Foreest, Jorden 2461

[D]2b4r/1p3kb1/3p1nq1/P1pPp1p1/P1P1PpPn/1NN2P2/2KBB3/5RQ1 b - - 0 30

The comment on chessbase:

[Event "NK Open, Dieren"]
[Site "?"]
[Date "2014.07.24"]
[Round "3"]
[White "Kolbus, Dietmar"]
[Black "Van Foreest, Jorden"]
[Result "0-1"]
[WhiteElo "2303"]
[BlackElo "2461"]
[SetUp "1"]
[FEN "2b4r/1p3kb1/3p1nq1/P1pPp1p1/P1P1PpPn/1NN2P2/2KBB3/5RQ1 b - - 0 30"]
[PlyCount "7"]
[EventDate "2014.??.??"]

{What would you play with Black?} 30... Nxf3 $3 {I gave two exclamation marks
to this daring and honestly speaking, extraordinary positional sacrifice,
since I believe it simple deserves it. It is not the first time I am
mentioning the refreshing chess the young Jorden is playing; the point he
received in this game is the guerdon of his no-half-measure treatments. And of
course, of his excellent play. In the game} 31. Bxf3 {followed, which was
answered with} Rh3 32. Qg2 Rg3 33. Qh1 Nxg4 {where Black grabbed a pawn, then
another and after 30 more moves, the game.} 0-1


If the move Nxf3 only draws then it would already deserve 2 !! because the engines here favour white.
But if this is really winning then we can add 2 more !! for this move.
The first critical move is I believe 33 Qh1, my SF prefers 33 Qe2 but fails also low after some thinking.

[zullil]

This is a position during NK open between Kolbus, Dietmar 2303–Van Foreest, Jorden 2461

Here is the game:

[pgn]
[Event "Dutch Open"]
[Site "Dieren, NL"]
[Date "2014.07.24"]
[Round "3"]
[White "Kolbus, Dietmar"]
[Black "Van Foreest, Jorden"]
[ECO "A05"]
[WhiteElo "2303"]
[BlackElo "2461"]
[Result "0-1"]

1. Nf3 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. d4 O-O 6. Be2 e5 7. O-O Nc6 8. d5 Ne7 9. Nd2 Nd7 10. b4 f5 11. Nb3 Nf6 12. f3 f4 13. a4 g5 14. g4 h5 15. h3 Kf7 16. Kf2 Rh8 17. Ke1 a5 18. bxa5 c5 19. Kd2 hxg4 20. hxg4 Rh3 21. Kc2 Ng6 22. Bd2 Qh8 23. Rh1 Bd7 24. Qf1 Rh4 25. Qg2 Qh7 26. Rxh4 Nxh4 27. Qh1 Rh8 28. Rb1 Qg6 29. Qg1 Bc8 30. Rf1 Nxf3 31. Bxf3 Rh3 32. Qg2 Rg3 33. Qh1 Nxg4 34. Kb2 Nf6 35. Bd1 g4 36. Bc2 f3 37. Rf2 Rh3 38. Qc1 Qh5 39. Be3 g3 40. Rf1 Bg4 41. Nd2 g2 42. Rg1 Bh6 43. Bf2 Rh1 44. Qe1 Qh2 45. Nb3 Bf4 46. Nb5 Bg3 47. Nxd6+ Kg6 48. Bxg3 Qxg1 49. Qc3 f2 50. Qxe5 f1=Q 51. Qe7 Qa1+ 52. Nxa1 Qxa1+ 53. Kb3 Rb1+ 54. Bxb1 Bd1+ 55. Bc2 Qb1+ 56. Ka3 Qc1+ 57. Ka2 Qxc2+ 58. Ka1 Qc3+ 59. Kb1 Bc2+ 60. Ka2 Qb3+
[/pgn]

[zullil]

[D]2b4r/1p3kb1/3p1nq1/P1pPp1p1/P1P1PpP1/1NN2n2/2KBB3/5RQ1 w - - 0 31

A deep search by the latest Stockfish build suggests that the sacrifice is unsound. Stockfish sees the position above as favoring White (and likely winning for White):

Code: Select all

info depth 53 seldepth 82 score cp 185 nodes 516186220378 nps 22764473 time 22675078 multipv 1 pv e2f3 h8h3 f3g2 h3g3 d2e1 g3c3 e1c3 f6e4 b3d2 e4g3 c2b3 g3f1 g2f1 c8d7 f1e2 d7a4 b3a3 g6c2 g1a1 g7f6 a1b2 f6e7 b2c2 a4c2 a3b2 c2h7 e2f3 h7g6 f3e4 g6e4 d2e4 f7e8 b2c2 e8d7 c2d2 d7d8 d2d3 d8e8 e4d2