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| Thread: Chess courses with pics! |  This thread is pages long: 1 ... 6 7 8 9 10 ... 20 30 · «PREV / NEXT» |
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Ecoris
Promising
Supreme Hero
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posted August 10, 2008 10:37 AM |
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Apparently it will not be a tie as I initially guessed; black will win:
If both players only move their pawns white will promote its pawn at the time the black one has reached a2. Then the black pawn will queen checking white and win white's queen and the game.
If white moves its king to f6 (or some other position) instead of promoting its pawn black promotes its pawn and then move its queen to h8 and will eventually out-maneuvers white.
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homm3megejas
Adventuring Hero
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posted August 10, 2008 11:01 AM |
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If black beginn, they will win: 1. ... a5, (white king can't hold off black pawn- 2.Kd4 a4 3.Kc4 a3 4.Kb4 a2 and 5. ... a1Q wins) 2.h5 a4 3.h6 a3 4.h7 a2 5.h8Q a1Q+ and 6. ... Qh8* wins. If white try to run with a king: 5.Kf6 a1Q+ and (white can't go 6.Kg7  ) 6.Kg6(Kf7) Qh8. White king must go to g6-h6, otherwise they will lose a pawn, at the time black moves with his king in f5 (when white king is in h6), then white king are forced to go in h5 and black queen takes a pawn in h7.
If white beginn, they also will win. 1.Kd4 a5 2.Kc4 a4 3.Kb4 and white catches black pawn. If 2. ... Kd2 3.Kb5 Ke3, then 4.h5 and black king can't hold off a white pawn, and when black go a4, then white also must answer with Ka4*, and win. If 1. ... Kd2, then 2. h5 a5 3. h6 a4 4.h7 a3 5.h8Q a2 6.Kc4 and 7.Qa1, white will win, like black in the previous part (see up after 6.Qh8). If 1. ... Kb3 (or Kb2), then white plays the same, like after 1. ... Kd2, accept 6.Kd3 and 7.Qa1 and wins.
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JoonasTo
Responsible
Undefeatable Hero
What if Elvin was female?
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posted August 10, 2008 11:45 AM |
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Black wins. White gets to queen first but black gets his queen next move and checks the white king and when white moves the king out of the way black eats the queen.
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DON'T BE A NOOB, JOIN A.D.V.E.N.T.U.R.E.
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keldorn
Promising
Known Hero
that casts green flames
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posted August 10, 2008 12:10 PM |
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Good. Black wins with a skewer after queening.
Now let's wait for Doomforge to come up with a puzzle. I'm looking forward to see what has he invented. 
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Doomforge
Admirable
Undefeatable Hero
Retired Hero
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posted August 10, 2008 12:19 PM |
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Nothing yet  I wanted to write something about basic openings, including, of course, the good old King's Gambit, but I haven't got the time to do it yet. Go ahead with another puzzle if you have one 
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keldorn
Promising
Known Hero
that casts green flames
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posted August 10, 2008 12:29 PM |
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Edited by keldorn at 19:02, 10 Aug 2008.
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OK, opening course reserved for Doom.
Until then, we will deal with Zugzwang. This is a position when you don't want to move, but you must.
1........
2........
3........
4...Kp..
5.....pK
6........
7........
8........
In this case, whoever's move it is, loses. Because the king has to abandone his pawn (has no other legal move to defend it), and the other king will take the pawn on its next move. This is zugzwang. When any move you can make is harmful.
This exercise uses the theme of Zugzwang. Black to move and mate in 2.
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Asheera
Honorable
Undefeatable Hero
Elite Assassin
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posted August 10, 2008 07:03 PM |
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h5-h4
Then white is forced to do a e1-f1
and then black: d8-d1#
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Doomforge
Admirable
Undefeatable Hero
Retired Hero
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posted August 10, 2008 08:15 PM |
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good thinking, Asheera 
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keldorn
Promising
Known Hero
that casts green flames
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posted August 10, 2008 10:21 PM |
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Yeah, nice work! So I guess zugzwang isn't a difficult thing to learn and to exploit. Let's move on to endgame courses. (Somewhat shorter than the openings, thus Doom can prepare his lessons while we finish these ones)
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keldorn
Promising
Known Hero
that casts green flames
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posted August 11, 2008 09:59 AM |
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Edited by keldorn at 10:14, 11 Aug 2008.
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Now I'm trying to get rid of the endgame quickly, in 1 post.
The endgame's definition is a bit unclear. Some people say that it begins after the trade of queens, others say after one of the players have only 2 major pieces.
In the endgame, your goal is to promote one of your pawns, thereby breaking the power balances to your favour. To do this, you usually need the help of your major pieces (if any) and even your king. Altough the king likes safety in the middlegame (castling), he becomes a useful attacking piece later, when there's no danger on the board.
Let's begin with the king and pawn endgames.
In this case, it's an advantage if you have pawns both on the kingside and queenside. So the enemy king can deal with only one side, you can deal with the other, and the promotion is easy.
Giving mate in the endgame with:
-2 heavy pieces:
This is the easies tway to give mate. You cut the enemy king's way with the first piece, and give check with the other. As it can never move backwards, because your 2nd piece blocks its way, it is restricted to flee forwards. Continue this until the last rank or file, and you have given checkmate.
-1 heavy piece:
This is a bit harder. First, you cut off the king again. But here, you'll need your own king, too. The preferred position is:
To acieve this, you must force your opponent to take the opposition (the space between the 2 kings are an odd number. The one who takes the opposition has the advantage)
In this case, taking the opposition is a disadvantage, as you can give check with your rook, and the king has to go backwards, like previously.
-2 pawns:
You force the enemy king to capture one of your pawns, by starting to advance it to the promotion square. Then, exploiting your time you've just gained, you promote the other pawn. Peahaps you'll need your king's help if your 2 pawns are close to each other.
-1 pawn:
OK this is a difficult story. Here, the kings' opposition decides the game. If you have it, you win. If you lose it, the game is drawn. If the pawn is on the files B-G, then:
You get your king to one of the critical squares (the 3 squares in front of your pawn), and force the enemy king one rank backwards. The preferred position is:
Here, with your king on B7, your pawn has a paved road to the queening square, and black can never take it. This is achieved by the opposition. But be careful. Opposition doesn't always help. See this:
Whoever's move it is, it's a draw. If it's balck's move, he takes the
opposition by moving to D6. If its white's, then he can't take the opposition, as his own pawn occupies the opposition square. Draw!
If the pawn is on A or H file, then winning is almost impossible. If the opponent king can reach the corner of the board, it can never be dislodged, and it's draw. So, you must get to the corner first, but keeping your pawn under surveillance, too. Thus you need to advance 2 pieces simultaneously, while your opponent nedds to do so with only 1 piece. Furthermore, if the enemy king is closer to the corner than yours, it's also a dead draw. The king only has to go back and forth in the corner, and he can never be driven out from there without heavy pieces.
So in the endgame, you have to consider many things to win the game. The main question often is: Should the players trade into a king and pawn endgame? Calculate everything in advance. Prepare for the worst. Take the opposition and win
Endgame puzzles soon!
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Asheera
Honorable
Undefeatable Hero
Elite Assassin
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posted August 11, 2008 01:20 PM |
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Quote:
Whoever's move it is, it's a draw. If it's balck's move, he takes the opposition by moving to D6. If its white's, then he can't take the opposition, as his own pawn occupies the opposition square. Draw!
I find it that White wins though
Case 1:
Black moves to D6, White does c4-c5+
d6-c6
d4-c4
and then Black will be forced to flee back, let's say c6-c7
c4-b5
then black moves the king somewhere, and white advances his pawn again (c5-c6)
I think White will manage to promote the pawn in the end.
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keldorn
Promising
Known Hero
that casts green flames
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posted August 11, 2008 01:44 PM |
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Quote:
I find it that White wins though
Case 1:
Black moves to D6, White does c4-c5+
d6-c6
d4-c4
and then Black will be forced to flee back, let's say c6-c7
c4-b5
then black moves the king somewhere, and white advances his pawn again (c5-c6)
I think White will manage to promote the pawn in the end.
After Kd6; c5+, black plays Kc6. After this, white can take a meaningless opposition with Kc4, but this can't be maintained. Black simply plays Kc7, and the pawn is still blockading the opposition square. White has to advance the king near the pawn again, and the routine begins all over again until the enemy king reaches the promotion square. There, he can either take the pawn or stalemate. In either case, it's draw.
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Asheera
Honorable
Undefeatable Hero
Elite Assassin
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posted August 11, 2008 01:49 PM |
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Quote:
White has to advance the king near the pawn again, and the routine begins all over again until the enemy king reaches the promotion square. There, he can either take the pawn or stalemate. In either case, it's draw.
I think White can avoid a stalemate. Let's say the Black King is at c8 and the white pawn at c7. White King will avoid being at c6 (to avoid a stalemate) and will be with his King either at d6 or b6, and black will be forced to move the King away from c8, to d7 or b7 (depending on where the White King is). Then the White King can advance one square forward (d7 or b7, depending on where it was) and then he will be able to promote the pawn, no matter what Black does
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keldorn
Promising
Known Hero
that casts green flames
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posted August 11, 2008 02:05 PM |
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Try it out, it won't work. The black king behaves in a different way in the last rank. He plays for stalemate, which can't be avoided.
You would be right, if white could move twice. But he cant... so it's a sad draw.
If you still don't believe me, I can show you in a chess game. There are a lot of websites where you can play for free. Altough you can't set up your own position, we'll play it out from the beginning, focusing to reach our position.
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keldorn
Promising
Known Hero
that casts green flames
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posted August 13, 2008 06:42 PM |
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While we're still waiting for Doom, here's another puzzle:
White to play and mate in four, using Zugzwang. (puzzle source: www.chessbase.com/puzzle)
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Asheera
Honorable
Undefeatable Hero
Elite Assassin
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posted August 14, 2008 09:27 PM |
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I give up, I can't find a mate in four moves
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TheDeath
Responsible
Undefeatable Hero
with serious business
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posted August 14, 2008 10:17 PM |
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This is actually easy. White can move the Rook somewhere like A3-B3, then Black is forced to move the pawn G4-G3, right?
Then white B3-B4# and it's mate? That it?
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The above post is subject to SIRIOUSness.
No jokes were harmed during the making of this signature.
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Asheera
Honorable
Undefeatable Hero
Elite Assassin
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posted August 14, 2008 10:33 PM |
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G5-G4
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TheDeath
Responsible
Undefeatable Hero
with serious business
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posted August 14, 2008 10:39 PM |
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Edited by TheDeath at 23:12, 14 Aug 2008.
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oh yeah. 
I'm still thinking about it...
EDIT: Ok I got it, but you need to sacrifice your Rook. I don't know if it's the best solution thus:
White: A3-H3 and then Black takes the rook: G4-H3+ and even gives check to the White King. Then White moves the King: G2-F3. Black has no other option, but to do G5-G4+, another check. White King then moves up: F3-F4. Again, Black has no options but to advance the pawn: G4-G3. Finally, White takes the pawn and deals mate to Black King: H2-H3#
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The above post is subject to SIRIOUSness.
No jokes were harmed during the making of this signature.
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Asheera
Honorable
Undefeatable Hero
Elite Assassin
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posted August 14, 2008 11:10 PM |
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Edited by Asheera at 23:15, 14 Aug 2008.
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I'm thinking something like:
a3-a5
g4-g3
h2xg3+
h4-g4
... but then I don't know what to do (black can move only h5-h4 in this situation)
EDIT: Death, seems you got the solution (wow, that was just complicated...)
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