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freshbacon & lycanwerewolf PROO
I was surprised I got the first 3 moves correct.
Too easy for Thursday
Great,if 1...cxb5 then 2.Be5+ Kc6 3.Bd7+ Kc4 4.Bd6#
You have to start off with your Knight in order to free a path up for your Bishop. If you start off with your Rook, then you pretty much come to a dead end. Black has an option to capture your Knight with his pawn, but that willl only lead to a Mate in 3. After that, all of the moves are forced and Black's fate is sealed.
The following is a copy of Post #155 on Page 8 by @elindauer:
I take decisions in these puzzles exactly the way I play OTB. My goal is to find the best move with the least amount of calculation. In this case, I solved the puzzle in 3 steps:
phase 1: calculating forcing lines
- check material, see that white is winning.
- start calculating forcing lines. My first glance was Rd7+ Kb8 Rxg7. I evaluate this as winning for white but not resignable yet. This becomes my main line.
- consider other forcing checks / captures. I happened to look at Nb5+ next. First I tried Nb5+ cxb5 Rd7+. The king has a couple choices, I tried Kb8 Be5+ Ka8 and ran into a wall. I evaluate this as worse then my main line and discard it. I note that letting the king get to a8 kills my attack, and try Nb5+ cxb5 Be5+ Kc6. I look for forcing continuations, and see Rc3+, Bd7+ ... oh, Bd7+ Kc5 Bd6#... is mate! ok. So Nb5 cxb5 wins for white.
Now I looked at Nb5+ Kb8 Bd4+ Ka8 Nc7+ Kg8. I can see that Ne6+ here wins the exchange, and I already evaluate this as better than my main line. So I cut off my calculation and call this my main line.
Return to calculating forcing lines in the original position... Nd5+ cxd5 ... wait, no, Nd5+ Kb8 transposes to the main line and this is black's option. No need to calculate Nd5+ cxd5 since black will only play this if it worse for me then my main line. Ignore.
So I am ready to move. I go to the puzzle and play Nb5+ Kb8 Be5+ Ka8 Nc7+.
Phase 2: where to put the knight.
- from phase 1 I already have a main line: Ne6+ Ka8 Nxc8. I extend a little farther and see Rxc8 Bxg7 picking up another pawn too. I evaluate this as totally winning for white. In time trouble I would play this instantly. With a few minutes to spare, I calculate the alternatives:
- Na6+ Ka8 and I see nothing better then just Nc7+ repeating moves. Discard.
- Ne8+... aha this allows Rd8... Ka8 Rd8+ Bc8 Rxc8+ Kb7. I can't stop calculating just yet since the knight is pinned. However I see that Rc7+ followed by Ne6 will save the knight. Since I prefer to win the bishop then to win the exchange, and I can see that there is still some life in this line left to calculate, I evaluate this as better then Ne6+ and continue...
- Rd8+ Rxd8... Ne6+... nothing really coming to mind here. I am ready to move.
So I go to the puzzle and play Ne8+ Ka8 Rd8+ Bc8 Rxc8+ Kb7.
Phase 3: calculating the win.
Same song, different verse. I know that I have Rc7+ and just save the knight, with a winning 3 minor pieces vs a rook endgame. I calculate a few more forcing lines to see if there is a mate:
- Nd6+ is nice, only 1 answer... Ka6... Bf1+ b5... Bxb5+ cxb5 Rc6+ Ka5... seems promising but I'm not quite seeing the knockout. I put this under "consider again later" and return to other ideas
- Rb8+ Ka6 Bc8+ Kb5 I have h5+, f5+... oh wait, I see that Rb8+ Ka6 Nc7+ only allows Ka5... now Bc3+... is mate! ok I'm ready to play.
Rb8+ Ka6 Nc7+ Ka5 Bc3 winner winner chicken dinner.
So this mate in 9 can be taken over the board as three different 3 move combinations. You don't have to see the whole thing up front to solve it. Hope that helps.
A very clever puzzle, even though I need someone to fully analyze it to spot why cxb5 isnt good of an answer
long drawn out.
nice one especially the first move of knight
long but nice puzzle
I became unstuck with this puzzle as there is no Queen to sacrifice.
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