The worth of a move can at times be calculated by adding together what each player wins by making that move. Use this method to solve this problem.
(;AB[fa]AB[fb]AB[gb]AB[eb]AB[bb]AB[dc]AB[dd]AB[de]AB[cf]AB[ef]AB[ff]AB[fe]AB[fd]AW[ed]AW[ec]AW[fc]AW[hc]AW[hb]AW[ha]AW[ga]AW[gd]AW[ge]AW[gf]AW[id]AW[lc]LB[gc:A]LB[bh:6]LB[dh:7]LB[fh:8]LB[hh:9]LB[jh:10]LB[lh:11]C[There are no other plays and no ko threats. Place a stone on the intersection that indicates how much 'A' is worth.]AP[goproblems]
(;B[fh]C[Correct! Black 'A' would win 6 points for the triangle stones and their intersections + the point 'b' for 7 points.White 'A' would force Black to play at 'c' winning a point for White. Thus, 7 + 1 = 8.RIGHT]LB[gc:A]LB[bh:6]LB[dh:7]LB[fh:8]LB[hh:9]LB[jh:10]LB[lh:11]TR[fc]TR[ec]TR[ed]LB[ee:b]LB[db:c])
(;W[bh]LB[bh:6]LB[dh:7]LB[fh:8]LB[hh:9]LB[jh:10]LB[lh:11]LB[gc:A]C[Sorry, 'A' is worth more.CHOICE])
(;W[dh]LB[gc:A]LB[bh:6]LB[dh:7]LB[fh:8]LB[hh:9]LB[jh:10]LB[lh:11]C[Sorry, 'A' is worth a little more.CHOICE])
(;B[hh]LB[gc:A]C[Sorry, 'A' is worth a little less.CHOICE]LB[bh:6]LB[dh:7]LB[fh:8]LB[hh:9]LB[jh:10]LB[lh:11])
(;W[jh]LB[gc:A]LB[bh:6]LB[dh:7]LB[fh:8]LB[hh:9]LB[jh:10]LB[lh:11]C[Sorry, 'A' is worth less.CHOICE])
(;W[lh]LB[gc:A]LB[bh:6]LB[dh:7]LB[fh:8]LB[hh:9]LB[jh:10]LB[lh:11]C[Sorry, 'A' is worth much less.])
(;B[gc]C[NOTTHIS])
(;B[db]C[NOTTHIS])
(;B[ah]C[NOTTHIS])
(;B[bg]C[NOTTHIS])
(;B[ch]C[NOTTHIS])
(;B[bi]C[NOTTHIS])
(;B[dg]C[NOTTHIS])
(;B[di]C[NOTTHIS])
(;B[eh]C[NOTTHIS])
(;B[fg]C[NOTTHIS])
(;B[fi]C[NOTTHIS])
(;B[gh]C[NOTTHIS])
(;B[hg]C[NOTTHIS])
(;B[hi]C[NOTTHIS])
(;B[ih]C[NOTTHIS])
(;B[jg]C[NOTTHIS])
(;B[ji]C[NOTTHIS])
(;B[kh]C[NOTTHIS])
(;B[li]C[NOTTHIS])
(;B[lg]C[NOTTHIS])
(;B[mh]C[NOTTHIS])
(;B[ag]C[NOTTHIS])
(;B[cg]C[NOTTHIS])
(;B[ai]C[NOTTHIS])
(;B[ci]C[NOTTHIS])
(;B[eg]C[NOTTHIS])
(;B[ei]C[NOTTHIS])
(;B[gg]C[NOTTHIS])
(;B[gi]C[NOTTHIS])
(;B[ig]C[NOTTHIS])
(;B[ii]C[NOTTHIS])
(;B[kg]C[NOTTHIS])
(;B[ki]C[NOTTHIS])
(;B[mg]C[NOTTHIS])
(;B[mi]C[NOTTHIS])
(;B[ee]C[NOTTHIS]))