(;AP[Hexon:0.0]FF[4]GM[11]SZ[15]C[2022/12/30

Mason's 2v2 v2

Black a15\: Frank
White a1\: Mason
Black o1\: Peter
White\: o15\: Sarah

Each player can only play in "their" half of the board, including the relevant diagonal.

For example, Frank can only play on the a15 side of the short diagonal, and on the short diagonal itself.

Black wins.
]PL[B]
;B[h8]C[Frank]
;W[i7]C[Mason]
;B[l11]C[Peter]
;W[m5]C[Sarah]
;B[c4]C[Frank]
;W[g7]C[Mason]
;B[h7]C[Peter]
;W[l12]C[Sarah]
;B[k12]C[Frank
]
;W[i5]C[Mason]
;B[f6]C[Peter
]
;W[k6]C[Sarah]
;B[e11]C[Frank]
;W[d12]C[Mason
]
;B[h6]C[Peter]
;W[i9]C[Sarah]
;B[e12]C[Frank]
;W[h5]C[Mason]
;B[g6]C[Peter]
;W[g9]C[Sarah]
;B[f9]C[Frank]
;W[f5]C[Mason]
;B[g5]C[Peter]
;W[j6]C[Sarah]
;B[d4]C[Frank]
;W[e10]C[Mason]
;B[m10]C[Peter]
(;W[h9]C[Sarah

The next variations were also played.]
 ;B[f10]C[Frank]
 ;W[g8]C[Mason]
 ;B[h3]C[Peter]
 ;W[i8]C[Sarah]
 ;B[e8]C[Frank]
 ;W[e9]C[Mason]
 ;B[l6]C[Peter]
 ;W[l5]C[Sarah]
 ;B[f8]C[Frank]
 ;W[e7]C[Mason]
 ;B[k10]C[Frank on behalf of Peter]
 ;W[d14]C[Sarah]
 ;B[f7]C[Frank]
 ;W[g4]C[Mason]
 ;B[h4]C[Frank on behalf of Peter]
 ;W[f13]C[Sarah]
 ;B[e14]C[Frank]
 ;W[b14]C[Mason]
 ;B[h2]C[Frank on behalf of Peter]
 ;W[e13]C[Sarah]
 ;B[g12]C[Frank]
 ;W[c13]C[Mason]
 ;B[h1]C[Frank on behalf of Peter]
 ;W[f12]C[Sarah]
 ;B[g11]C[Frank]
 ;W[resign]C[Mason])
(;W[f10]
 ;B[h9]
 ;W[h3]
 ;B[g4]
 ;W[g11]
 ;B[h10]
 ;W[g3]
 ;B[f4]
 ;W[h11]
 ;B[i10]
 ;W[f3]
 ;B[e4]
 ;W[i11]
 ;B[j10]
 ;W[c3]
 ;B[e2]
 ;W[j11]
 ;B[d11]
 ;W[d3]
 ;B[e3]
 ;W[k10]
 ;B[d10]
 ;W[e8]
 ;B[l9]
 ;W[k9]
 ;B[d8]
 ;W[d9]
 ;B[l6]
 ;W[b14]
 ;B[b10]
 ;W[c10]
 ;B[k7]
 ;W[l8]
 ;B[b11]
 ;W[c11]
 ;B[m7]
 ;W[m8]
 ;B[f11]
 ;W[n2]
 (;B[o7]
  ;W[g10]
  ;B[b12]
  ;W[c12]
  ;B[n8])
 (;B[n7]
  ;W[g10]
  ;B[b12]
  ;W[c12]
  ;B[n8]
  ;W[j8]
  ;B[b13]
  ;W[c13]
  ;B[l5]
  (;W[k5]
   ;B[a15]
   ;W[a14]
   ;B[l4])
  (;W[l4]
   ;B[a15]
   ;W[a14]
   ;B[k5]
   ;W[l7]
   ;B[j13]
   ;W[k4]
   (;B[j5]
    ;W[m6]
    ;B[e9]
    ;W[g8])
   (;B[m6]
    ;W[n9]
    ;B[e9]
    ;W[g8]
    (;B[j5]
     ;W[m9])
    (;B[m9]
     ;W[i14]
     ;B[f8]
     ;W[f7]
     ;B[j5]
     ;W[j14]
     ;B[m13]
     ;W[i6]
     ;B[j4]
     ;W[i13]
     ;B[k13]
     ;W[k2]
     ;B[i3]
     ;W[k14]
     ;B[l13]
     ;W[i4]
     ;B[j3]
     ;W[l15]
     ;B[n14]
     ;W[j1]
     (;B[n13])
     (;W[f2]
      ;B[h4]
      ;W[m14]
      ;B[k15]
      ;W[e1]
      ;B[f1]
      ;W[l14]
      ;B[m15]
      ;W[a1]
      ;B[n13])))))))
