Puzzle of the week #233

Submitted by Eugen on Mon, 10/14/2013 - 18:46

The f7-weak spot (1)

Chess Diagram
[Event "Puzzle #233"][Date "2013.10.14"][Result "1-0"]1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.O-O gxf3 6.Qxf3 Qf6 7.e5! Qxe5 8.Bxf7+!? Kxf7 9.d4 Qxd4+ 10.Be3 Qf6 11.Bxf4 Bg7 12.Nc3 Ne7 13.Nd5! Nxd5 14.Qxd5+ Qe6 15.Bd2+ Kg8
Replay the opening moves available for this game. Your tasks:
a) List all unusual moves so far and why are they like that
b) What was White's main idea?
c) White to move and win

Total available points for this puzzle is 13. The answers will be published next week together with puzzle #234.

Puzzle #232 solution:
Valer Eugen Demian, 2013. I was very happy to see so many responses; keep it up! You will get better at chess faster by solving these puzzles. Do not forget to answer correctly to all questions! Missing or wrong answers will see you lose points. Since 9 of you have got the most points, I chose a random answer for publishing here; it is Callum's answer:
a) Yes the position is possible to reach while playing if white is up a bishop and a knight and trades off everything in the position.
b1) Bd6+ was the last move played by white in this position, black has 2 choices, c8 or a8 with c8 being the better square because he dosen't hang mate in one. The a8-square however, was where the king went and is the worst move because he hangs mate in one move.
b2) See below solution

Brian was the only one to figure out in class why I asked if the position was possible or not: it was because normally a Knight plus Bishop must mate the lone King in a corner of the same colour as the Bishop.
[Event "Puzzle #232"][Date "2013.10.04"][Result "1-0"][SetUp "1"][FEN "k7/8/K2B4/8/2N5/8/8/8 w - - 0 1"]1.Nb6#

Correct solutions:
Callum, Mrinal, Eric, Toro, Aaron, Coco, Cody, Anya, Ilya - 13 points
Jalen, Brandon, Oliver, Bradley - 11 points
Brian - 10 points
Benjamin - 5 points