(;AP[goproblems]AB[bc]AB[bd]AB[cc]AB[dc]AB[db]AB[ca]AB[ae]AW[be]AW[bg]AW[ce]AW[cd]AW[dd]AW[ed]AW[ec]AW[eb]AW[ea]AW[da]AW[af]LB[gb:0]LB[gc:1]LB[gd:2]LB[ge:3]LB[gf:4]LB[gg:5]C[Black to move - How many different moves can guarantee sure life?FORCE](;B[gd]C[Yup! ;) (You can browse the eplanations when using 'Navigate Solution' under 'Show Solution'.)RIGHT](;W[bf]C[This will prevent the applet from auto playing the possible variations.NOTTHISRIGHT])(;W[ge]LB[ba:L]LB[bb:L]LB[ab:Ko]LB[ad:x_x]LB[aa:x_x]LB[ac:x_x]LB[cb:x_x]C[Logical moves are explained here.](;B[ba]LB[ad:x]LB[bb:x]LB[ab:x](;W[ab]LB[bb:V];B[bb]LB[ac:A]LB[ad:B]C[Black'd live!RIGHT])(;W[bb]LB[ab:V];B[ab]C[Black'd live.RIGHT])(;W[ad]LB[ac:V]LB[ab:V]LB[bb:V]C[(bA17 is bigger than bA18 by one point, but leaves an imidiate ko threat. bB18 leaves the 1 moku reductino as a sente move for the endgame or potentially a ko threat - Is much worse than the other 2.)](;B[ac]LB[ab:A]LB[bb:B]C[Black'd live.RIGHT])(;B[ab]C[Black'd live.RIGHT])(;B[bb]LB[ab:A]LB[ac:B]C[Black'd live.RIGHT])))(;B[bb]C[Black'd live.RIGHT])(;B[ab]LB[ba:o]LB[ad:x]LB[bb:x]C[The only correct move for white here, is at B19 for a ko. The rest'd let live.](;W[ba]LB[bb:V]LB[cb:x]LB[ad:x]C[bB18 is the correct black move in theis situation. The rest are suicide.](;B[bb];W[cb]MA[ca]C[Only a ko... Could be better...];B[ca]C[NOTTHIS])(;B[cb];W[ad]C[Black'd die!])(;B[ad];W[cb]C[Black'd die!]))(;W[ad]LB[ba:V]LB[bb:V](;B[ba]C[Black'd live.])(;B[bb]C[Black'd live.]))(;W[bb]LB[ba:V]LB[ad:x](;B[ba]C[Black'd live.])(;B[ad];W[ba]C[Black'd die.])))(;B[ad]LB[bb:o]LB[ba:x]C[wB18 is the correct move - wB19 lets black get a ko.](;W[ba]LB[bb:V]LB[cb:x]LB[ab:x]C[bB18 is the correct black move in theis situation. The rest are suicide.](;B[bb];W[cb]MA[ca]C[Only a ko... Could be better...];B[ca]C[NOTTHIS])(;B[cb];W[ab]C[Black'd die!])(;B[ab];W[cb]C[Black'd die!]))(;W[bb]LB[ba:x]LB[ab:x](;B[ab];W[ba]C[Black'd die!])(;B[ba];W[ab]C[Black'd die!])))(;B[aa]LB[bb:x];W[bb]LB[ad:x]LB[ab:x]LB[ba:x](;B[ab]LB[ad:o];W[ad]C[Black'd die.])(;B[ba]LB[ab:A]LB[ad:B]C[Black'd die. (Thanks, Alexei)])(;B[ad]LB[ab:o]LB[ba:o](;W[ab]LB[cb:x];B[cb]C[Black'd die.])(;W[ba]C[Black'd die.])))(;B[ac]LB[ab:x]LB[bb:o]LB[ba:x]C[Only wB18 is a sure kill now.](;W[bb]C[Black'd die.])(;W[ba]LB[bb:V]LB[cb:x](;B[bb]LB[cb:o];W[cb]MA[ca];B[ca]C[NOTTHIS])(;B[cb]C[Black'd die.]))(;W[ab]LB[bb:V];B[bb]C[Black'd live.]))(;B[cb]LB[ab:o]LB[ad:o]LB[ba:o]LB[ac:x]LB[bb:x]LB[aa:x]C[Any of the marked with 'o' moves would kill.](;W[ab]C[Black'd die.])(;W[ba]LB[ab:A]LB[ad:B]C[Black'd die.])(;W[ad]LB[ab:A]LB[ba:B]C[Black'd die.])(;W[aa]LB[ab:o];B[ab]LB[ad:A]LB[ba:B]C[Black'd live.])(;W[bb]LB[ab:o];B[ab]C[Black'd live.])(;W[ac]LB[ab:o];B[ab]LB[ad:A]LB[ba:B]C[Black'd live.]))))(;B[gb]C[The correct anwser is 2. You could use 'Navigate Solution' under 'Show Solution' following the correct number (2) to see why.])(;B[gc]C[The correct anwser is 2. You could use 'Navigate Solution' under 'Show Solution' following the correct number (2) to see why.])(;B[ge]C[The correct anwser is 2. You could use 'Navigate Solution' under 'Show Solution' following the correct number (2) to see why.])(;B[gf]C[The correct anwser is 2. You could use 'Navigate Solution' under 'Show Solution' following the correct number (2) to see why.])(;B[gg]C[The correct anwser is 2. You could use 'Navigate Solution' under 'Show Solution' following the correct number (2) to see why.]))
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