Puzzles - Revision history

Demer: /* Puzzle 5 */ fixed wrong color (spotted by bobson)

2024-01-05T12:23:10Z

‎Puzzle 5: fixed wrong color (spotted by bobson)

Selinger: /* Eric Demer */ Some copy-edits.

2024-01-04T18:49:51Z

‎Eric Demer: Some copy-edits.

Demer: I added five 5x5 puzzles, so I made a section for mine.

2024-01-04T18:36:32Z

I added five 5x5 puzzles, so I made a section for mine.

Selinger: /* Puzzle 3 */ Fixed typo in HexWorld link

2023-07-08T15:09:55Z

‎Puzzle 3: Fixed typo in HexWorld link

Hexanna: add puzzle

2023-07-08T12:39:07Z

add puzzle

Hexanna: edit link

2023-07-02T04:49:15Z

edit link

Demer: /* See also */ put in link to article I just created

2023-07-01T07:51:56Z

‎See also: put in link to article I just created

Hexanna: remove puzzle 5 and renumber puzzles; see "Solutions to puzzles" talk page

2023-05-07T15:42:59Z

remove puzzle 5 and renumber puzzles; see "Solutions to puzzles" talk page

Hexanna: convert puzzle to hexboard

2023-05-07T15:34:34Z

convert puzzle to hexboard

Selinger: Added HexWorld links

2023-04-25T18:35:49Z

Added HexWorld links

@@ Line 103: / Line 103: @@
 === Puzzle 5 ===
-Blue to move.
+Red to move.
 <hexboard size="5x5"

@@ Line 59: / Line 59: @@
 == [[User:Demer|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.    However, for each of them, the player who's turn it is has exactly 1 winning move.
+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
+Red to move.
 <hexboard size="5x5"
@@ Line 73: / Line 73: @@
 === Puzzle 2 ===
-Blue to move
+Blue to move.
 <hexboard size="5x5"
@@ Line 83: / Line 83: @@
 === Puzzle 3 ===
-Blue to move
+Blue to move.
 <hexboard size="5x5"
@@ Line 93: / Line 93: @@
 === Puzzle 4 ===
-Red to move
+Red to move.
 <hexboard size="5x5"
@@ Line 103: / Line 103: @@
 === Puzzle 5 ===
-Blue to move
+Blue to move.
 <hexboard size="5x5"
@@ Line 111: / Line 111: @@
 Try it on [https://hexworld.org/board/#5c1,e2b5a1e1 HexWorld].
-The next two puzzles were based on positions from games.
+The next two puzzles are based on positions from games.
 === Puzzle 6 ===
-By Eric Demer. Red to play and win.
+Red to play and win.
 <hexboard size="6x6"
@@ Line 126: / Line 125: @@
 === Puzzle 7 ===
-By Eric Demer. Blue to play and win.
+Blue to play and win.
 <hexboard size="7x7"
@@ Line 136: / Line 135: @@
 Try it on [https://hexworld.org/board/#7c1,a2:pg2c4b5b4e5d7c5d5e3e4g3 HexWorld].
+=== Other ===
+Eric Demer also has a [[Worst_move_puzzles#Puzzle_3|worst-move puzzle]].
-I also have [[https://www.hexwiki.net/index.php/Worst_move_puzzles#Puzzle_3|a worst-move puzzle]].
 == Other authors ==

@@ Line 56: / Line 56: @@
 Try it on [https://hexworld.org/board/#7c1,d4:sf2e4f5f4 HexWorld].
 == Other authors ==
@@ Line 121: / Line 204: @@
 === Puzzle 6 ===
 By [[User:Hexanna|Hexanna]]. Red to play and win.

@@ Line 88: / Line 88: @@
     />
-Try it on [https://hexworld.org/board/#10c1,a3f4e7d9f5c9g4h2h4i2g3g2f3f2e3e2b4a4b3d3c5b5c4d4d5e5e6d6e4g8 HexWorld].
+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].

← Older revision		Revision as of 12:39, 8 July 2023
Line 141:		Line 141:
	Try it on [https://hexworld.org/board/#7c1,a2:pg2c4b5b4e5d7c5d5e3e4g3 HexWorld].		Try it on [https://hexworld.org/board/#7c1,a2:pg2c4b5b4e5d7c5d5e3e4g3 HexWorld].

		+	=== Puzzle 8 ===
		+	By [[User:Hexanna\|Hexanna]]. Red to play and win.
		+
		+	<hexboard size="13x13"
		+	coords="show"
		+	contents="R a3 h3 g4 h5 g6 i6 c7 i7 j7 g8 k8 h9 k9 d10 i10 k11
		+	B i2 g3 i3 d4 j4 j6 f7 g7 h7 h8 i8 i9 j9 l9 j10 k10"
		+	/>
		+
		+	Try it on [https://hexworld.org/board/#13c1,a3j4d10d4g6g7h5f7i6i3g4g3h3i2c7h8j7j6i7i9k8j10k11l9i10j9h9i8g8h7k9k10 HexWorld].
	== See also ==		== See also ==

@@ Line 143: / Line 143: @@
 == See also ==
-* [[Worst Move Puzzle]]
+* [[Worst move puzzles]]
 * [[Solutions to puzzles]]
 * [[Ladder puzzles]]

@@ Line 107: / Line 107: @@
 === Puzzle 5 ===
 By Ryan B. Hayward. Red to play and win.
@@ Line 131: / Line 120: @@
 Source: Ryan B. Hayward, "A puzzling Hex primer" (https://webdocs.cs.ualberta.ca/~hayward/papers/puzzlingHexPrimer.pdf).
-=== Puzzle 7 ===
+=== Puzzle 6 ===
 By Eric Demer. Red to play and win. Red has exactly one winning move.
@@ Line 141: / Line 130: @@
 Try it on [https://hexworld.org/board/#6c1,a6:sa3e1b2d1 HexWorld].
-=== Puzzle 8 ===
+=== Puzzle 7 ===
 By Eric Demer. Blue to play and win.

@@ Line 60: / Line 60: @@
 === Puzzle 1 ===
-By [[John Tromp]]
+By [[John Tromp]]. Blue to play and win.
-−
 Blue to play and win.
-−
-<hex> R10 C10 Q1
-                   Ri1
-            Bg4 Rh4
-         Bf5 Rg5
-      Be6 Rf6
-   Bd7
-Rc8
-     Rd9 </hex>
 Try it on [https://hexworld.org/board/#10c1,i1d7c8e6f6f5g5g4h4:pd9 HexWorld].

@@ Line 13: / Line 13: @@
 === Puzzle 1 ===
 Red to play and win.
 <hex>R7 C7 Q1
@@ Line 20: / Line 20: @@
       Hc5 Ve5
 Va6</hex>
 === Puzzle 2 ===
 Red to play and win.
 <hex>R7 C7 Q1
@@ Line 29: / Line 31: @@
            Hf5
      Vb6</hex>
 === Puzzle 3 ===
@@ Line 39: / Line 43: @@
     contents="B c2 R f4"
     />
 === Puzzle 4 ===
@@ Line 48: / Line 54: @@
     contents="B f4 e4 d4 R f5 f2"
     />
 == Other authors ==
@@ Line 55: / Line 63: @@
 Blue to play and win.
 <hex> R10 C10 Q1
@@ Line 65: / Line 72: @@
 Rc8
       Rd9 </hex>
 === Puzzle 2 ===
@@ Line 74: / Line 83: @@
 Vb5
 </hex>
 === Puzzle 3 ===
@@ Line 83: / Line 94: @@
 B e2 f2 g2 h2 i2 b3 d3 d4 f4 b5 e5 d6 g8 c9 d9"
     />
 Source: this [[Little Golem]] forum [http://www.littlegolem.net/jsp/forum/topic2.jsp?forum=50&topic=14 thread].
@@ Line 95: / Line 108: @@
 B b2 g2 f3 f4 e5"
     />
 Source: this [[Little Golem]] forum [http://www.littlegolem.net/jsp/forum/topic2.jsp?forum=50&topic=212 thread].
@@ Line 107: / Line 122: @@
     />
-=== Puzzle 6 ===
+Try it on [https://hexworld.org/board/#11c1,a4g8c6h2b5e7b9 HexWorld].
-From Ryan B. Hayward, "A puzzling Hex primer" (https://webdocs.cs.ualberta.ca/~hayward/papers/puzzlingHexPrimer.pdf). Red to play and win.
 <hexboard size="6x6"
     coords="show"
     contents="R a4 a6 B a5 b5"
     />
 Note that this position is [[Equivalent patterns|equivalent]] to the position with the pieces at a5 and a6 removed.  This could arise in response to the [[Small_boards#Winner_depending_on_the_first_move|winning opening move a4]].
 === Puzzle 7 ===
@@ Line 124: / Line 145: @@
     contents="R a3 b2 B d1 e1 f1"
     />
 === Puzzle 8 ===
@@ Line 133: / Line 156: @@
    contents="R g3 g2 e5 e3 c5 b5 a2 B d7 e4 d5 c4 b4"
    />
 == See also ==