Two bishops and king against king

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Grenade90


Hello everyone,

first of all, I want to apologize for my english... But I think I'll receive more answers if I (try to) write in english. ^^

So, I bought the James Eade's book "The chess player's Bible". The autor explains how to mate a single king, when we have a king and two bishops (we play with the whites).

The white pieces are in this position : Bf6, Bg6 and Kh6. The black king's position is : Kf8. Whites are to move. (See thed diagramm... if it works)

I thought the whites could only play : Kh7 to mate. But, the autor says, that whe have to play : Bg5 (black king g8), Be7 (black king h8), Bf5 (black king g8), Be6+ (black king h8) and Bf6#. I understand how the autor's technique works, but why can"t we only play Kh7 ? Can the black king approach the white king ?

What I try to do :

 

Thanks in advance. happy.png

nklristic

If you play Kh7, the game is over and it is a draw by stalemate. Black king is not in check, but black doesn't have any legal move.

Grenade90

ChessBaus69 and nklristic => Oh, thanks! That was so easy to understand, I don't know how I couldn't find it by myself...

Free-de-la-hoy : I'm a "sister". ^^ I never understood what exactly is a blog on chess.com... How a blog can help me?

nklristic

You're welcome. happy.png

j0kai
Another thing to point out is that, even if Kh7 wasn’t stalemate, to mate with a king and 2 bishops the enemy king (black in this case) needs to be in any of the corner squares (a1, a8, h1, or h8) so you’d be pushing it away from the corner with Kh7 anyway which would mean extending the game by the amount of moves needed to finally make the checkmate; that is, assuming you didn’t run out of time or stalemate another way before that.
jonnin

first, visualize a 2 rook checkmate. 
the rooks cut off an entire row/column each, so one of them prevents the king from walking back towards the middle of the board by cutting off the retreat row and the other one checks AND blocks off the row where the check happens.  Of the 3 rows a king can move into if out in the open alone and unbothered, 2 of them are gone, and it is forced to the third.  You keep forcing until the edge of the board, where the same pattern becomes mate. 

now the diagonals are harder to manage, but its the same idea: 2 bishops can lock 2 diagonals down, but you can't do that AND check: if you check, the king can diagonally sneak back towards the middle of the board again.  You have to support with the king to block off squares and use the 2 bishops to seal off a wall (both color diagonals) forcing the king backwards.  Its a similar idea but you have to keep the king blocking off escape squares to make progress to the edge of the board for the win.  

Grenade90

Kujo and Jonnin => thanks a lot for the tips. happy.png