Puzzle of the week #175

Submitted by Eugen on Sat, 11/26/2011 - 22:27

Center blast

Chess Diagram
[Event "Puzzle #175"][Date "2011.11.26"][Result "0-1"]1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.e5 Nfd7 5.Nce2 c5 6.c3 Nc6 7.Nf3 b5 8.Nf4 Qb6 9.Be2 cxd4 10.cxd4 g5
Replay the opening moves available for this game. Black throws caution to the wind and decides to brutaly force White to give up the very precious d4-pawn. Your tasks:
a) Analyse the position carefully for both sides and decide if this last move for Black 10... g5 is a strong move or a mistake
b) Continue the game with the best possible line you can come up with for both sides
c) What is the most likely result?

Total available points for this puzzle is 25. The answers will be published next week together with puzzle #176.

Puzzle #174 solution:
Game: Podgorny, J - Bubenik, J. Prague, 1940. Two students are sharing again the best solutions as follows:
a) Harmony wrote:
For white - it has no center pawn. But white is more developed and has two bishops out in very good positions. King has castled and is quite safe.
For black - it has a stronger center. However, black king is not safe in the center and still needs two moves at least to do the castle. Black pieces are not well developed.

She preferred White.
b) Philip put together the best line; see solution:
[Event "Puzzle #174"][Date "2011.11.21"][Result "1-0"][SetUp "1"][FEN "r1b1kb1r/pp3p1p/4p1p1/2PpqnB1/6Q1/3B4/PPP2PPP/RN3RK1 w kq - 0 1"]1.Bb5+ {Philip} 1...Bd7 2.Bxd7+ Kxd7 3.Qa4+ Kc8 4.Qe8+ Kc7 5.Qxf7+ (5.Qxa8? {Three students were too superficial and fell for the trick} 5...Bxc5 6.Bf4 (6.Qxh8? Qxh8 {Black is winning}) 6...Qxf4 7.Qxh8 {Position is now equal}) 5...Kc6 6.Bf6 {White will win a rook}

Correct solutions:
Harmony, Philip - 20 points
Ziyao, Alex, Leo - 15 points
Leroy - 12 points
Derrick, James - 10 points
Daniel - 5 points

Philip - 79 points
Harmony - 74 points
Ziyao - 71 points
James - 59 points
Alex - 57 points
Leo - 56 points
Derrick - 45 points
Daniel - 44 points
Leroy - 38 points
Frank - 14 points