Triade and The Game of Pegpen
Pipopipette or Quadratini are Italian names (at least in the 1980s) for Dots and Boxes (invented by François Edouard Anatole Lucas in 1889). The game is quite well-known being, perhaps, the second most famous of the pencil and paper games after Tic-Tac-Toe.
I'm mentioning the Italian name because I found at Pergioco, issue of July 1981, a curious variant of this game, called Triade. The game is played in the same grid and colors, but players are also able to connect diagonals.
Rules:
- At his turn, a player makes a new connection between two corners of a square.
- A player scores for each triangle with all three sides drawn by him
- The value of the triangle is given by its area (e.g., the smallest triangles value 0.5 points)
- Notice that after a move, several triangles can be closed
- If a player scores, he does not play again (unlike Dots and Boxes)
- When the game ends, wins the player with highest score (players may also decide a fixed value to achieve a win)
The original page with the game description:
An automatic translation of the Triade rules:
The game represents the triangular equivalent of Pipopipette, but adds to the game a greater richness of strategic themes, ultimately being more varied and interesting than its predecessor. Here too, the material consists of graph paper and two pens of different colors, and the game begins by defining a playing area. Players take turns making a move, which consists of drawing a line segment in two possible ways: either by retracing a side of any square or by drawing one of the two diagonals, always of a square of their choice.
Points are scored in the ways shown in the examples in Figure 2; from these it is clear that only triangles with all three sides of the same color score points, and they have a minimum size of half a square. In Triad, unlike Pipopipette, the move does not remain with the player who has "closed" triangles, but passes alternately from one to the other.
In this game it is possible that with a single move, multiple triangles can be closed.
In the example in Fig. 3, the player with the solid line, by drawing the segment A-B, simultaneously closes the triangles E-F-G (worth 4 points), A-C-E (worth 1 point), A-B-C (worth ½ point) and A-B-D (also worth ½ point), thus obtaining 6 points with a single move.
In Fig. 4 we see a diagram that shows the situation of a game already in progress; in this situation, if it were the turn of the player with the solid line, he could, by drawing the segment A-B, obtain 2 and ½ points; if instead it were the turn of the player with the dashed line, he could draw the segment A-B to take away this good opportunity from his opponent, or, if he wanted to score points, draw the segment C-D and obtain 3 points.
Triad can be played until all possible moves are exhausted, but it is more fun and simpler to set a score to reach before the opponent.
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The Game of Pegpen is a 1929 uncredited game, published at Stoll & Edwards Company.
This is also a variant of Dots and Boxes, but where instead of four moves to own a square, the players need eight moves (!)
The rules:
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Another iteration of this concept is 1968's Squaresville by Cadaco Publisher.
The golden squares value two points for the player that surrounds them. Notice also that some walls are already placed, so the board does not start empty.
The rules:














































