Difference between revisions of "Puzzles"

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(→‎See also: put in link to article I just created)
(→‎Puzzle 5: fixed wrong color (spotted by bobson))
 
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Try it on [https://hexworld.org/board/#7c1,d4:sf2e4f5f4 HexWorld].
 
Try it on [https://hexworld.org/board/#7c1,d4:sf2e4f5f4 HexWorld].
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== [[User:Demer|Eric Demer]] ==
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Despite their small size, the following five 5x5 puzzles are quite difficult: ​ They come from computer brute-force search of sparse 5x5 positions via a tablebase, specifically aiming for the hardest puzzles from such positions. ​ For each of them, the player whose turn it is has exactly 1 winning move.
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=== Puzzle 1 ===
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Red to move.
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<hexboard size="5x5"
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  contents="R e4 a2 B c3 b2"
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  />
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Try it on [https://hexworld.org/board/#5c1,e4c3a2b2 HexWorld].
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=== Puzzle 2 ===
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Blue to move.
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<hexboard size="5x5"
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  contents="R d5 e1 B a2"
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  />
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Try it on [https://hexworld.org/board/#5c1,d5a2e1 HexWorld].
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=== Puzzle 3 ===
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Blue to move.
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<hexboard size="5x5"
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  contents="R a4 e3 B d1"
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  />
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Try it on [https://hexworld.org/board/#5c1,a4d1e3 HexWorld].
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=== Puzzle 4 ===
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Red to move.
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<hexboard size="5x5"
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  contents="R e5 a1 B e1 c1"
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  />
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Try it on [https://hexworld.org/board/#5c1,e5e1a1c1 HexWorld].
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=== Puzzle 5 ===
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Red to move.
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<hexboard size="5x5"
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  contents="R e2 a1 B b5 e1"
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  />
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Try it on [https://hexworld.org/board/#5c1,e2b5a1e1 HexWorld].
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The next two puzzles are based on positions from games.
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=== Puzzle 6 ===
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Red to play and win.
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<hexboard size="6x6"
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  coords="show"
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  contents="R a3 b2 B d1 e1 f1"
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  />
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Try it on [https://hexworld.org/board/#6c1,a6:sa3e1b2d1 HexWorld].
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=== Puzzle 7 ===
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Blue to play and win.
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<hexboard size="7x7"
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  coords="show"
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  edges="all"
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  contents="R g3 g2 e5 e3 c5 b5 a2 B d7 e4 d5 c4 b4"
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  />
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Try it on [https://hexworld.org/board/#7c1,a2:pg2c4b5b4e5d7c5d5e3e4g3 HexWorld].
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=== Other ===
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Eric Demer also has a [[Worst_move_puzzles#Puzzle_3|worst-move puzzle]].
  
 
== Other authors ==
 
== Other authors ==
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   />
 
   />
  
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Try it on [https://hexworld.org/board/#10c1,a3f4e7d9f5c9g4h2h4i2g3g2f3f2e3e2b4a4b3d3c5b5c4d4d5e5e6d6e4g8 HexWorld].
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Try it on [https://hexworld.org/board/#10c1,a3f4e7d9f5c9g4h2h4i2g3g2f3f2e3e2b4b3a4d3c5b5c4d4d5e5e6d6e4g8 HexWorld].
  
 
Source: this [[Little Golem]] forum [http://www.littlegolem.net/jsp/forum/topic2.jsp?forum=50&topic=14 thread].
 
Source: this [[Little Golem]] forum [http://www.littlegolem.net/jsp/forum/topic2.jsp?forum=50&topic=14 thread].
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=== Puzzle 6 ===
 
=== Puzzle 6 ===
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By Eric Demer. Red to play and win. Red has exactly one winning move.
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By [[User:Hexanna|Hexanna]]. Red to play and win.
  
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<hexboard size="6x6"
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<hexboard size="13x13"
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  coords="show"
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  contents="R a3 b2 B d1 e1 f1"
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  />
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Try it on [https://hexworld.org/board/#6c1,a6:sa3e1b2d1 HexWorld].
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=== Puzzle 7 ===
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By Eric Demer. Blue to play and win.
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<hexboard size="7x7"
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   coords="show"
 
   coords="show"
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  edges="all"
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   contents="R a3 h3 g4 h5 g6 i6 c7 i7 j7 g8 k8 h9 k9 d10 i10 k11
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   contents="R g3 g2 e5 e3 c5 b5 a2 B d7 e4 d5 c4 b4"
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            B i2 g3 i3 d4 j4 j6 f7 g7 h7 h8 i8 i9 j9 l9 j10 k10"
 
   />
 
   />
  
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Try it on [https://hexworld.org/board/#7c1,a2:pg2c4b5b4e5d7c5d5e3e4g3 HexWorld].
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Try it on [https://hexworld.org/board/#13c1,a3j4d10d4g6g7h5f7i6i3g4g3h3i2c7h8j7j6i7i9k8j10k11l9i10j9h9i8g8h7k9k10 HexWorld].
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== See also ==
 
== See also ==
  
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* [[Worst Move Puzzle]]
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* [[Worst move puzzles]]
 
* [[Solutions to puzzles]]
 
* [[Solutions to puzzles]]
 
* [[Ladder puzzles]]
 
* [[Ladder puzzles]]

Latest revision as of 12:23, 5 January 2024

Solving puzzles is a very good way of becoming a stronger player. Solve as many as possible! And feel free to post your own puzzles here.

Piet Hein's puzzles

See article Piet Hein's puzzles

Claude Berge's puzzles

See article Claude Berge's puzzles

Bert Enderton

Puzzle 1

Red to play and win.

abcdefg1234567

Try it on HexWorld.

Puzzle 2

Red to play and win.

abcdefg1234567

Try it on HexWorld.

Puzzle 3

Red to play and win.

This is a very difficult puzzle whose complete solution is extremely complex.

abcdef123456

Try it on HexWorld.

Puzzle 4

Red to play and win.

abcdefg1234567

Try it on HexWorld.

Eric Demer

Despite their small size, the following five 5x5 puzzles are quite difficult: ​ They come from computer brute-force search of sparse 5x5 positions via a tablebase, specifically aiming for the hardest puzzles from such positions. ​ For each of them, the player whose turn it is has exactly 1 winning move.

Puzzle 1

Red to move.

abcde12345

Try it on HexWorld.

Puzzle 2

Blue to move.

abcde12345

Try it on HexWorld.

Puzzle 3

Blue to move.

abcde12345

Try it on HexWorld.

Puzzle 4

Red to move.

abcde12345

Try it on HexWorld.

Puzzle 5

Red to move.

abcde12345

Try it on HexWorld.


The next two puzzles are based on positions from games.

Puzzle 6

Red to play and win.

abcdef123456

Try it on HexWorld.

Puzzle 7

Blue to play and win.

abcdefg1234567

Try it on HexWorld.

Other

Eric Demer also has a worst-move puzzle.

Other authors

Puzzle 1

By John Tromp. Blue to play and win.

abcdefghij12345678910

Try it on HexWorld.

Puzzle 2

By lazyplayer. Blue to play and win.

abcdefg1234567

Try it on HexWorld.

Puzzle 3

By David J Bush. Taken from a game on Playsite in 2003. Red to play and win.

abcdefghij12345678910

Try it on HexWorld.

Source: this Little Golem forum thread.

Puzzle 4

Designed by Door1, helped by David J Bush. Inspired by a game on Kurnik in May 2005. Blue to play and win.

abcdefghij12345678910

Try it on HexWorld.

Source: this Little Golem forum thread.

Puzzle 5

By Ryan B. Hayward. Red to play and win.

abcdef123456

Try it on HexWorld.

Note that this position is equivalent to the position with the pieces at a5 and a6 removed. This could arise in response to the winning opening move a4.

Source: Ryan B. Hayward, "A puzzling Hex primer" (https://webdocs.cs.ualberta.ca/~hayward/papers/puzzlingHexPrimer.pdf).

Puzzle 6

By Hexanna. Red to play and win.

abcdefghijklm12345678910111213

Try it on HexWorld.

See also

Cameron Browne offers a lot of original puzzles in his book Hex Strategy Making the Right Connections

Matthew Seymour has created a website with 500 interactive Hex puzzles at http://www.mseymour.ca/hex_puzzle/hexpuzzle.html

Ryan Hayward and Bjarne Toft include several sets of puzzles in their book Hex: The Full Story, including 49 puzzles originally published in Politiken, 28 unpublished puzzles by Jens Lindhard, 99 puzzles by Henderson, and the 4 puzzles by Bert Enderton.

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