00:00His pawn is on C2, but his king is not ideally located.
00:07So, can we use it?
00:11And this is a very interesting case of chess geometry.
00:15Pure chess geometry.
00:17How it works, and it's very difficult to find.
00:21But I think it's beautiful.
00:24Though for machines it will be very simple.
00:27Not for the human eye.
00:29So, how can we stop it?
00:33So, we need just to do something with our queen.
00:36We could just put her on the first strike.
00:38Yeah, but then he goes king d2.
00:40Queen b2, he goes king d1.
00:43Now we pin on b3, maybe, but that doesn't matter.
00:46That doesn't matter, he's there.
00:48He's on the right side.
00:51It doesn't work.
00:53So, any other ideas?
00:55For instance, if we go queen e4 check.
00:58For instance.
00:59King d2.
01:00King d2.
01:01Because he cannot go on c3, but it's important.
01:02Because then we go check, and we block the square.
01:07So, he has to go on d2.
01:10But it seems that we run out of ideas.
01:13Aren't we?
01:14So, what else left?
01:19How about this check?
01:23That separates, or potentially separates.
01:26Okay.
01:27So, he cannot go here.
01:28We already know that.
01:29Because we give check on d4, and make sure that we put our queen and a1 protecting this square.
01:35So, there are two options.
01:36He can go on e2.
01:38But here is another interesting trick.
01:42You should remember that sometimes we can let opponent queen.
01:46But then the queen is trapped, and if our king is close enough, we can have this winning position.
01:52So, a pin.
01:53King d1.
01:54And now.
01:55So, a pin.
01:56King d1.
01:57And now.
01:58King d1.
01:59And now.
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