SQUARUBORUS

[variant of Ouruborus] Players take turns moving both ends of the slime-worm, each to some adjacent cell. After each move, each end leaves a stone of that player's colour. The worm may not move onto a coloured cell.

If at some point before the board is full, a worm-end cannot move normally, the players continue, making single moves if necessary, until the next player who is able to must split the other end into two heads.

A player wins if he makes a 4 in-a-row with his stones (ortho or diag). If both ends become blocked simultaneously, the last player to move wins.

Sample Game:

J starts: sw.se w.ne n.s e.nw n.n n.ne w.n w.se
ne.se n.s sw.s sw.se se.s s.w s.nw s.s ne.w? e.n & wins

Final Position:

. . b . . . . .
. j j b j b . .
b b j j j b . .
. j j b b b j .
. b b j j j b .
. j J B . . j .
. b . . B j . b
. . . . J b b j

TRI-HEX

Each player drops a triangle group of 3 pieces (2 of its color) on empty cells. A triangle may also be dropped with pieces overlapping other triangles provided the colors do not change, and at least one previously vacant cell could not be filled by a regular move.

Sample Game:  
    ___xx_______oo__ (was swapped)
1.  f4  ne    l8 n
2.  p6  sw    o9 ne
3.  u7  sw    n4 s
4.  j6  ne    s7*nw  
5.  u5  sw    u11 n
6.  z8  sw    u9 ne  
7.  x6  sw    resign  

Final Position:

             X X X
: abcdefghijklmnopqrstuvwxyzABCDEFGHIJK  
| . . . . . . . . . . . . .             1
|  . . . . . . . . . . . . .            2
|   . . x . . . . . . . . . .  O        3
|    . o x . . x . . . . . . .  O       4
|     . . . x o o . x o . . . .  O      5
|  O   . . o x x o o x X O . . .        6
|   O   . . o o x o x o X . . . .       7
|    O   . . x . o . x o x o . . .      8
|         . . . x o . x o x . . . .     9
|          . . . . . o o . . . . . .   10
|           . . . . . x . . . . . . .  11
|            . . . . . . . . . . . . . 12
|             . . . . . . . . . . . . .  
: abcdefghijklmnopqrstuvwxyzABCDEFGHIJK    
                    X X X

Truncated Progressive Chess

Basic progressive chess; but giving or releasing check, promoting or capturing
may not be done in a move series, except that the series be voluntarily
shortened to length one. (The subsequent series are unaffected.)

Sample Game:

1. e4
2. d5 e5
3. c4 d4 f4
4. Bg4 f5 Nf6 Nf3
5. a4 b4 h4 g3 Be2
6. h5h4h3 Bf3g2 Qe7
7. g4 g5 b5 Bf3 Ne2 Rg1 Nd1
8. Nb4 a5 b6 Ng4 g6 Bg7 c5 Rc8
9. B:g2
10. Nd3+
11. Kf1 (F)
12. Ne3++

Final Position:

. . r . k . . r
. . . . q . b .
. p . . . . p .
p O p p p p O .
O . O O O O . .
. . . n n . . p
. . . N N . B O
R . B Q . K R .