On my quest to obtain chess logic I'm constantly experimenting. Can you describe the chess logic that leads to the solution of this composition?
|White to move. Mate in two.|
8/5r2/7Q/R2q1b2/2pkpbR1/8/2P5/K2N2Nr w - - 0 9
The first area of attention is the escape room of the black king. The only square he can escape to is e5. So the first question that arises is: Is there a move that covers both d4 (target) and e5 (escape square). There is no need to vulture around and write an essay about what we SEE in the rest of the position. Mate ends the game. Prof. Adriaan de Groot proved that a grandmaster considers way less moves than an amateur. Grandmaster are faster because they consider less. They can't be faster in another way.
There are two pieces that can cover both d4 and e5. Namely Ng1 and Qh6.
Line of attack
The second area of attention are the LoA's. Let us start with the knight. 1.Nf3 does the job. Are there any obstacles on the line of attack? That brings us to the defenders.
The third area of attention are the defenders of the lines of attack. Pawn e4 covers a f3, which happens to be the point of pressure from where the knight must deliver mate. So the next question is: can we annihilate the defender?
There is a whole host of methods to annihilate a defender. Lure it away, exchange it, attack, it block it, et cetera. It turns out that pinning it looks viable. This reveals another line of attack. From Rg4 towards the black king. So the story repeats itself. The process is recursive. What is the defender of the LoA from Rg4 to Kd4?
The line of attack is blocked by the black bishop Bf4. Which raises the next question, how can Bf4 be annihilated?
It turns out that luring it away looks the most viable option. How to lure away Bf4?
The fourth area of attention is the tempo battle. You can't just take Bf4, since this hands over the initiative to the opponent. So you must look for moves that are more forcing.
The hierarchy is:
- Threaten mate in one
There is no viable check here, but there is an interesting threat of mate in one: 1.Qd6.
This reveals a third line of attack: Qd6 (pivotal point)- Qd5# (point of pressure)
The white queen is untouchable. Bf4 can't take it, because that would put pawn e4 in a pin. The black queen can't take it. since she must block rook a5.
Which reveals the fourth line of attack: Ra5 - e5. Remember that e5 is the escape square.
Summarizing: all logic revolves around PoPLoAFun.
e5 (escape square)
LoA's (pointing to the points of pressure)
Ng1 - Nf3 - PoP's d4 and e5
Rg4 - PoP d4
Qh6 - Qd6 - PoP's d4 and e5
Ra5 - PoP e5
Logic prunes the tree of analysis rigorously.
The following pieces play just a static role:
Pawns c2, c4
Since they play no role in effecting the lines of attack their moves don't need to be considered. No need to write an essay about during solving the problem. The vulture can ignore them. They are just time consuming distractions.