Sabin Rains

Sabin Rains is played on an empty 5x5 hexagonal board.
On each turn,each player drops a stone on an empty cell.
A stone cannot be placed on a cell which does not have an adjacent empty cell.
When a stone is placed,it flips all enemy stones that are sandwiched between itself and a friendly stone along a hex ring.
When five enemy stones are located on a hex ring,the dropped stone will flip all five.
Hex Ring:The set of six cells surrounding any cell on the board.
When no more moves are available,wins the player with more stones.