Problem	4531
Created	2004-05-26
Source
Rating

Difficulty	15.5 kyu
Average Solve Time	25 secs
User Attempts	6182 / 12199
Solve Ratio Rating	10 kyu
	rating history

(;AB[ab]AB[bb]AB[cb]AB[da]AW[db]AW[eb]AW[fb]AW[fc]AB[dc]AB[ec]AB[ed]AB[ee]AB[ef]AB[dg]AB[cf]AW[df]AW[de]AW[dd]AW[cg]AW[cc]AW[bc]AW[ac]AW[bd]TR[ab]TR[bb]TR[cb]C[black to save his marked stones]AP[goproblems] (;B[be];W[ba] (;B[cd];W[ca] (;B[ad]C[RIGHT]) (;B[aa];W[ca] (;B[ad]C[RIGHT]) (;B[ba];W[ca]))) (;B[ce];W[ca] (;B[cd];W[aa]) (;B[aa];W[ca])) (;B[ca];W[ea] (;B[cd];W[aa]) (;B[aa];W[ba]) (;B[ce];W[aa])) (;B[ad];W[ae];B[cd]C[right but a16 was not necessaryRIGHT])) (;B[ce];W[ba] (;B[cd];W[ca] (;B[be];W[aa]) (;B[aa];W[ca])) (;B[be];W[ca] (;B[aa];W[ca]) (;B[cd];W[aa]))) (;B[cd];W[ce] (;B[bf];W[be] (;B[ae];W[bg];B[af];W[ag]) (;B[bg];W[ae])) (;B[be];W[bf])) (;B[bf];W[ba];B[ce];W[ca] (;B[cd];W[aa]) (;B[aa];W[ca])) (;B[ca];W[ea];B[ce];W[ba] (;B[aa];W[ba]) (;B[cd];W[aa])) (;B[ba];W[ea];B[ce];W[ca]C[very difficult ko for black]) (;B[aa];W[ca];B[ba];W[ca]))