Problem	654
Created	2001-06-02
Source
Rating

Difficulty	12.5 kyu
Average Solve Time	33 secs
User Attempts	4280 / 12425
Solve Ratio Rating	5 kyu
	rating history

(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2] SZ[19]RU[Japanese]KM[0.00]TM[] AW[ea][fa][fb][fc][fd][be][ce][de][ee]AB[da][eb][ac][bc][cc][dc][ec]C[white to kill]PL[W] (;W[ba]CR[ba] ;B[cb]CR[cb] (;W[ca]CR[ca]C[RIGHT ko is best]) (;W[ab]CR[ab] ;B[ca]CR[ca])) (;W[ca]CR[ca] ;B[ba]CR[ba] (;W[db]CR[db] ;B[cb]CR[cb] (;W[da]CR[da] ;B[ab]CR[ab]) (;W[ab]CR[ab] ;B[da]CR[da])) (;W[cb]CR[cb] ;B[bb]CR[bb])) (;W[cb]CR[cb] ;B[bb]CR[bb] (;W[ba]CR[ba] ;B[db]CR[db]) (;W[ca]CR[ca] ;B[ba]CR[ba])) (;W[bb]CR[bb] ;B[cb]CR[cb] (;W[ba]CR[ba] ;B[ca]CR[ca]) (;W[aa]CR[aa] ;B[ab]CR[ab])) (;W[db]CR[db] ;B[cb]CR[cb]) (;W[ab]CR[ab] ;B[cb]CR[cb] (;W[ba]CR[ba] ;B[bb]CR[bb]) (;W[bb]CR[bb] ;B[ba]CR[ba]) (;W[ca]CR[ca] ;B[ba]CR[ba])) (;W[aa]CR[aa] ;B[ba]CR[ba] ;W[bb]CR[bb] ;B[ab]CR[ab]))