20 Feb '13 21:13>3 edits
Actually it was played today.
Amin Bassem (GM )2632 - Andrew Muir (IM) 2313. White to play.
The tacical motif is a winning pin on the Black Queen.
The bones.
White can play Rxf5 answering ...Qxf5 with Be4.
So we go back to the original diagram.
And we see the plan opening up infront of our eyes with 1.Nxe5 and 2.Rxf5
Perhaps (I've added 'perhaps' but after years of studying blunders and their
causes, I'm sure I'm on the right course.)
The error has slipped in because there are three ways for Black to take back on e5.
1....Nxe5, 1....Bxe6 and 1....dxe5 and had to check each one before playing 1.Nxe5
and confirming the Rxf5 trick was still on.
At the moment the square f3 is covered twice and in two of the lines.
1...exe5 and 1...Bxe5 the square f3 is not hit.
if there was only one way to take back on e5, 1...Nxe5 then the GM's warning bells
may have would have kicked in.
(also White's mind is on Queen Winning Pins, not Queen Losing Forks.)
Here is what happened.
Amin Bassem (GM )2632 - Andrew Muir (IM) 2313. White to play.
The tacical motif is a winning pin on the Black Queen.
The bones.
White can play Rxf5 answering ...Qxf5 with Be4.
So we go back to the original diagram.
And we see the plan opening up infront of our eyes with 1.Nxe5 and 2.Rxf5
Perhaps (I've added 'perhaps' but after years of studying blunders and their
causes, I'm sure I'm on the right course.)
The error has slipped in because there are three ways for Black to take back on e5.
1....Nxe5, 1....Bxe6 and 1....dxe5 and had to check each one before playing 1.Nxe5
and confirming the Rxf5 trick was still on.
At the moment the square f3 is covered twice and in two of the lines.
1...exe5 and 1...Bxe5 the square f3 is not hit.
if there was only one way to take back on e5, 1...Nxe5 then the GM's warning bells
may have would have kicked in.
(also White's mind is on Queen Winning Pins, not Queen Losing Forks.)
Here is what happened.