Puzzle of the week #58

Submitted by oldadmin on

Mate in 2

Level
3-Bishop
Chess Diagram
[Event "Puzzle #58"][Date "2009.02.13"][Result "1-0"][SetUp "1"][FEN "8/4n2K/8/pNp5/rkB4Q/n1p1N3/8/8 w - - 0 1"]
Last week proved to be a tough but rewarding challenge for quite a few; no less than 7 of you have managed to come up with all 8 lines and the correct move order for all. This is excellent news! Right now you guys should be firing on all cylinders and solve this week's easy puzzle in no time. It has been composed by Otto Wurzburg back in 1936 and published in the American Chess Bulletin that same year. Your task:
a) White to move and mate in 2 (5 points)
b) Which White pieces should not move at the first move and why? (5 points for each correctly identified piece and correct reason; total 4 x 5 = 20 points)

Total available points for this puzzle is 25. The answers will be published next week together with puzzle #59.

Puzzle #57 solution:
This puzzle was great because it covered all possible and logical responses for both sides, a good example how each one of us needs to calculate before delivering the final blow in our games. Also it shows that material advantage is of no importance if the number of attackers is greater than all defenders. Last but not least it shows how important is to always have an answer to the best response from your opponent. Without further ado I present to you Karl's excellent solution:
[Event "Puzzle #57"][Date "2009.02.05"][Result "1-0"][SetUp "1"][FEN "r1b1r1k1/1p2n1n1/p3p2Q/4PpN1/3q4/2N5/PPP4P/1K4R1 w - - 0 1"]1.Qh7+ Kf8 2.Nxe6+ {Now there are some ways that black could get checkmated while trying to escape} 2...Kf7 (2...Nxe6 3.Qh6+ Kf7 4.Qf6#) (2...Bxe6 3.Qxg7#) 3.Nd8+ Qxd8 (3...Rxd8 4.Rxg7+ Ke8 (4...Kf8 5.Qh8+ Ng8 6.Qxg8#) 5.Rxe7+ Kf8 6.Qg7#) 4.Qxg7+ Ke6 5.Qf6+ Kd7 6.Qd6#

Correct solutions:
Mark, Jacky, John, Jeremy, Karl, Joshua - 40 points
Andy Q - 39 points
Humphrey, James - 15 points
Andy Yee - 10 points
Wilson - 5 points
Each wrong try gets a 1 point deduction in case of providing the correct solution.

Standings:
John - 94 points
Joshua - 89 points
Jeremy, Andy Qian - 87 points
Mark - 83 points
Jacky - 60 points
Andy Yee - 51 points
Karl - 47 point
James - 30 points
Humphrey - 27 points
Wilson - 25 points
Joanne - 21 points
Darren - 20 points
Marcus - 17 points
Katerina - 10 points
Nathaniel - 6 points