Tuesday, 19 May 2015

Teaching Kids - Pin - Part 2

Before proceeding, I recommend you to go through part -1.

Following to discussion on part-1, let's move on getting benefits out of pin. Basically there are four ways to get benefited from Pin.

1. Increase nos of attack on pinned piece.

Knight on c6 is pinned so you can simply win the piece by playing pawn d4 to d5. This method works very well with absolute pin though you can do the same with relative pin too. But with relative pin, pinned piece is not completely paralyzed.

2. Illusion

In this position if there is a no pawn h7, black can be checkmated with Rh8#. But you can break the defence with 1. Qxg6!! as 1... fxg6 is not possible due to the Pin (Bishop on b3 is pinning the f7 pawn). Therefore pawn on f7 is defending g6 is only illusion.

3. Changing pinned piece

Here 1. f6 (increasing nos of attack on pinned piece is not the proper one because of 1...g6. But it is often good idea to change the pinned piece in order to break the defence. In this case
1. Bxg7!! - Bxg7
2. f6 wins the queen otherwise it is checkmate.

4. Gaining a tempo

White is pawn plus but exchanging everything wouldn't solve the issue, for example
1. Bxf6 - Rxf6
2. Rxf6 - Kxf6
3. b5 - Ke6
4. b6 - Kd6
5. b7 - Kc7 = and Black king is in time to catch the pawn.

But what happned if white is a tempo ahead in the same position (Pawn is on b5 instead of b4). Obvious white can win the game by swap off all pieces. White can win this position with
1. Rxf6!! - Rxf6 (Now rook is pinned therefore white is able to gain a move with b4)
2. b4 -  Kf7
3. Bxf6 - Kxf6
4. b6 - Ke6
5. b7 - Kd7
6. b8=Q wins the game.

We will discuss a classical game on next article in order to explain "if & but" of pin.

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