Rock Paper Scissors Codegolf

x=(a,b)=>(a*2+b+1)%3-1

// a wins: 1
console.log(x(0,1))
console.log(x(1,2))
console.log(x(2,0))
// b wins: -1
console.log(x(0,2))
console.log(x(1,0))
console.log(x(2,1))
// ab draw: 0
console.log(x(0,0))
console.log(x(1,1))
console.log(x(2,2))