Puzzle of the week #178

Submitted by Eugen on Thu, 12/29/2011 - 23:18

Long mates (1)

Chess Diagram
[Event "Puzzle #178"][Date "2011.12.29"][Result "1-0"][SetUp "1"][FEN "r1bnk2N/pppqn2Q/6p1/3N4/2B1P3/8/P4PPP/b1B2RK1 w q - 0 1"]
It never hurts to practice tactics, or more precisely longer tactics where the solution is unique and like a very narrow passage to victory. Coming up with such calculations is always a challenge and that is the reason why long mates (longer than 4-5 moves) are always special. You can try your hand at a long mate in this wild position. Black has left the King in the center and is surrounded both by friends and foe. Your task:
a) White to move and mate in 10

Total available points for this puzzle is 20 (2 per each correct move). The answers will be published next week together with puzzle #179.

Puzzle #177 solution:
Game Ing. Ladislau Nagy - Valer Eugen Demian, corr, Timis county 1st Final, ROM 1989-90. I got three good answers: Leo, Daniel and Philip; each one of them got the essence of the position and winning idea for Black. Each one of them also had some mistakes in it, reason why nobody got the full number of points. Here is the solution, a mixture of these good answers and real game continuation:
[Event "Puzzle #177"][Date "2011.12.17"][Result "0-1"][SetUp "1"][FEN "r3r1k1/5pp1/2pq3p/p1b1n3/2PpB3/1P4QP/PB2RPP1/3R2K1 b - - 0 22"]22...Nxc4 {In the game} 23.Bh7+ (23.Qxd6 {Philip} 23...Nxd6 24.Bf3 (24.Bxd4 {Leo} 24...Rxe4 25.Rxe4 Nxe4 26.Bxc5 Nxc5 27.Rc1 {Black will be up by 2 points (one Knight for a Pawn)}) 24...Rxe2 25.Bxe2 Re8 {The a8-rook gets into the game. Black is one pawn up and still has the passed d-pawn. Black has obtained an advantage}) (23.bxc4 Qxg3 24.fxg3 d3+ {Discover check! Black will win some points for sure} 25.Kf1 {Daniel} 25...dxe2+ 26.Kxe2 Rxe4+ {Black is up a rook}) 23...Kxh7 24.Qd3+ Kg8 25.Rxe8+ Rxe8 26.Qxc4 Bb6 27.g3 Qe6 28.Qxe6 Rxe6 {Black won with ease at move 42}

Correct solutions:
Leo, Daniel - 18 points
Philip - 16 points
Derrick, James, Alex - 8 points

Philip - 135 points
Ziyao - 111 points
Harmony - 101 points

Leo - 96 points
James, Daniel - 87 points
Derrick - 83 points
Alex - 80 points
Leroy - 60 points
Frank - 24 points