CHICKEN GOMOKU (a game sample)

Black must make a 5-in-a-row, White must prevent him.
Both players play black moves until one declares
to be black, simultaneously passing.
Then alternation as usual starting with white.

a b c d e f g h i J: d3,i7,a9,i9,c9,i1,J takes x
. . . . . . . . x 1. e4 d6
. . . . . . . . . 2. d4 f6
. . . x . . o . . 3. e7 e5
. . . o o x . . . 4. c6 c7
. . . . x x x . . 5. b8 f4
. . o x . x . . . 6. g3 f5
. . x . o o . . x 7. f7 g5!!
. o . . . . . . . 8.
x . x . . . . . x 9.

And, at this point, J wins in 5 moves. Can you see how? playing at h6,g6,g7,g8,g9/g4 (select the previous text to see the solution).

Black has more resources in this game now that he needn't worry about defending against white attacks.

ABANONDAS

Like Epaminondas but phalanxes may also make 1-step orthogonal/diagonal sideslips//orthogonal sidesteps, provided all target cells are empty. Diagonal phalanxes can only make orthogonal sideslips.

Game Sample:
a b c d e f g h i j k l
                                 ooo              xxx
. . o o o o o o . . . .   1.  g1.g2 - g4    l14.k15 - l12
. . . . . . . . . . . .   2.  g3.g4 - f3    l12.l13 - k11
. . . . . . . . . . . .   3.  f1.f4 - f3        j14 - k13
. . . . . . . . . . . .   4.  f3.f6 - e3    k11.k15 - j10
. . . . . . . . . . o .   5.  e2.e6 - d3    j10.j15 - j7
. . . . . . . . . x o .   6.  k1.h1 - f1     j7.j12 - i6
. . . . . . . . . x o .   7.  d2.d7 - c3     i6.i11 - i2:2
. . . . . . . . . x o .   8.  l2.j2 - i2:1  b14.c15 - a13
. . . . . . . . . x o .   9.  l1.k2 - i4:1    i5.i7 - i4:1
o . . . . . . . . x . .  10.  i2.j2 - k2      i3.i6 - j4
o . . . . . . . . . . .  11.  g1.h2 - j4:1    j5.j7 - j10
o . . . . . . . . . . .  12.     k2 - j1     j8.j10 - i9
o . . . . . . . . . . .  13.  j1.j4 - j5    i14.i15 - i12
x . . . . . . . . . . .  14.  c2.c8 - b3        b15 - c15
. . x x x x . . x x . .  15.  b2.b9 - a10    i9.i13 - j9
                         16.  a1.a10: a13:3 b14.h14 - a14
a b c d e f g h i j k l  17.  ...(capturing 6 times )  
                         23.  i4.j4         g15.h15 - j15
                         24.  j8.j4 - k9     j9.j13 - j6
                         25.  b1.f1 - g1     resigns

CHICKEN GOMOKU

Black must make a 5-in-a-row in a 9x9 square board, White must prevent him.
Both players play black moves until one declares to be black, simultaneously passing.
Then alternation as usual starting with white.

a b c d e f g h i       bill first
. . . . . . . . .  1.    d3,h8,a9, J takes black
. . o . x . . . .  2. B: d6    c4 :J
. . . x o x . . .  3.    b5    e4
. . x . x o . . .  4.    f4    f5
. o . x x x o x .  5.    c2    h7
. . . o x . o o .  6.    g6    h5
. . . . o o . x .  7.    h6    e5
. . . . . . . x .  8.    g5    e6
x . . . . . . . .  9.    e2    e3
                  10.    e7    d5    
                  11.    f7    f3

After f3, J wins in 2 moves (can you see how?)

CHICKEN CHESS

Initially white has no king and two queens.
The goal is for white to capture the king, black to prevent this.
Otherwise FIDE rules; castling permitted whenever neither piece has moved.

All moves (alternating) go to black in the first phase.
Any player, may optionally, on his move, take the black army and pass.
Then the other player moves with White and regular play begins.

Sample

1. e5,Nf6,Bb4,0-0,B;d2,B;e1,B;f2,J takes black
2. Nf3    Re8
3. e4     N;e4
4. Qd5    Nd6
5. Bg5    Re7
6. B;e7   Q;e7
7. N;e5   Nc6
8. Ng4    Bb6
9. Bd3    Nb4
10 Qh5    N;d3
11 c;d3   h6
12 Nc3    Qg5
13 Q;g5   h;g5
14 h4     g;h4
15 R;h4   Bd4

r . b . . . k .
p p p p . p p .
. . . n . . . .
. . . . . . . .
. . . b . . N R
. . N O . . . .
O O . . . . O .
R . . . . . . .

In this moment, Black tries to swap as many material as he can, so that White could not have enough force, at endgame, to checkmate the black King.

Trabsact Sagme Diaries

The rules of a game must be as simple as possible, not simpler. [T. Sagme, Conversations with Einstein]

SAS FENCES

Cul-de-sac with 2 piece-moves/turn, and L-shaped walls allowed. Each player has one grenade, which may be played at the start of a turn to blast an unfillable hole in any unit of wall; and this uses the placement power for that turn.

Here is a match where the South player (ie, which must go to the north edge) was forced to close himself.

       S           N                  S           N
1.  -N  EGd     SE  FHi        11. WN  Je4    gJKf SS
2.  NW  GId     EE  Ei4        12. WN  JLi    SW  Hik
3.  SW  Jc2     WS  Dj4        13. SN  Ii2    NW  Hh3
4.  SW  Ic3     WW  Ck4        14. SN  Hh2    EE  Fh4!
5.  EE  Fg4     EN  Fk3        15. resign
6.  WN  Gb4     EE  Iac        16.
7.  EE  Fik     NE  Gik        17.
8.  SE  Kbd     SS  Jc4        18.
9.  EN  JLf     SW  Ij3        19.
10  SE  HJe     ES  IKk

Final Position:

  A   B   C   D   E   F   G   H   I   J   K   L
a +-------------------------------------------+ a
  |                               |           |
b |   +   +   +   +   +   ,---+   |   +   +   | b
  |                       |       |   |   |   |
c |   +   +   +   +   ,---+   +---.---;---|   | c
  |                   |           |   |   |   |
d |   +   +   +   +-------+-------+   +   +   | d
  |                                           |
e |   +   +   +   +   +   +   +-------+---+   | e
  |                                   |       |
f |   +   +   +   +   +   +   +   +   >   <---| f
  |                                           |
g |   +   +   +   +   +   +   +   +   +   +   | g
  |                           |         N     |
h |   +   +   +   +   ,---+---+---+   +   +   | h
  |                   |       |   |           |
i |   +   +   +   ,---+-------+   +---+-------| i
  |               |   |   | S |               |
j |   +   +   ,---+   |   |   |---.   +   +   | j
  |           |       |   |   |   |           |
k |   +   .---+   +---.   +   +   +-------+   | k
  |       |           |                       |
l +-------------------------------------------+ l
  A   B   C   D   E   F   G   H   I   J   K   L

In this position, South only route of escape is between Ii and Li, since everything else has double walls and he has only one grenade.

WEITUWEIQI

Oshiqi mechanics with both players playing "x"s. Chicken start.
Moves are mandatory, and if the game ends by stalemate then the winner is determined by whether the boundary has been reached.
Any boundary hit is a win for ESCAPER, otherwise BLOCKER wins.
Hitting the boundary before either side has declared is an immediate loss.

Unlur or "chicken" starting:-  both sides play moves as if for the weaker side, in this case blocker.  If at any time a player feels blocker is now certain to win, he announces "I Block!", but does not make a move. The other player is thus escaper and plays the first move in regular alternation.

Note: If, still on the first phase, a player makes a stalemate position he loses (the other say 'I block' and he cannot continue)

                           bill  joao
abcdefghijklmnopqrstu      ----------
     . x . . . x        1. a6    n7
    x x . x x x .       2. m8    r3
   . . . . . . . x      3. k6    h1
  x . . . . . x . x     4. g2    b4
 x x . . . . x . . x    5. j7    e2,sw
x . . . . x . . . . .   6. b7,e  m2
 x . . . x . x x : x    7. i8,nw c4
  . . . x . x . . x     8. k2    p7
   x . . . . o . .      9. o2,sw e10
    x . . . . : .      10. n5    d9
     . . . . . x       11. s4    d5
abcdefghijklmnopqrstu  12. s8    p1
                       13. t7    o4
                       14. BLOCK t5
                       15. p11   resigns

This game uses a similar concept as in Unlur, which might imply a new family of games: "Chicken Games".