A suggested list of handicaps and komi to use for difference board sizes. DGrd is the difference in the number of dan and/or kyu grades. DRat is the difference in Rating (EGF style), allowing for half stone differences. Negative komi means komi for white, positive is komi for black (in addition to the handicap). Handicap 0, for even games, means colors should be decided externally, e.g. by nigiri. Handicap 1 means the weaker player starts.
19x19 17x17 15x15 13x13 11x11 9x9 7x7 DGrd DRat H K H K H K H K H K H K H K 0 0 0, -7 0, -6 0, -7 0, -8 0, -7 0, -7 0, -9 50 1, 0 1, 0 1, -2 1, -4 1, -4 1, -5 1, -8 1 100 2, -7 2, -6 1, 3 1, 0 1, -1 1, -3 1, -7 150 2, 0 2, 0 2, -7 1, 4 1, 2 1, -1 1, -6 2 200 3, -7 3, -6 2, -2 2, -8 1, 5 1, 1 1, -5 250 3, 0 3, 0 2, 3 2, -4 2, -7 1, 3 1, -4 3 300 4, -7 4, -6 3, -7 2, 0 2, -4 1, 5 1, -3 350 4, 0 4, 0 3, -2 2, 4 2, -1 2, -7 1, -2 4 400 5, -7 5, -6 3, 3 3, -8 2, 2 2, -5 1, -1 450 5, 0 5, 0 4, -7 3, -4 2, 5 2, -3 1, 0 5 500 6, -7 6, -6 4, -2 3, 0 3, -7 2, -1 1, 1 550 6, 0 6, 0 4, 3 3, 4 3, -4 2, 1 1, 2 6 600 7, -7 7, -6 5, -7 4, -8 3, -1 2, 3 1, 3 650 7, 0 7, 0 5, -2 4, -4 3, 2 2, 5 1, 4 7 700 8, -7 8, -6 5, 3 4, 0 3, 5 3, -7 1, 5 750 8, 0 8, 0 6, -7 4, 4 4, -7 3, -5 1, 6 8 800 9, -7 9, -6 6, -2 5, -8 4, -4 3, -3 1, 7 850 9, 0 9, 0 6, 3 5, -4 4, -1 3, -1 1, 8 9 900 9, 7 9, 6 7, -7 5, 0 4, 2 3, 1 2, -9 950 9, 14 9, 12 7, -2 5, 4 4, 5 3, 3 2, -8 10 1000 9, 21 9, 18 7, 3 6, -8 5, -7 3, 5 2, -7 1050 9, 28 9, 24 8, -7 6, -4 5, -4 4, -7 2, -6 11 1100 9, 35 9, 30 8, -2 6, 0 5, -1 4, -5 2, -5 1150 9, 42 9, 36 8, 3 6, 4 5, 2 4, -3 2, -4 12 1200 9, 49 9, 42 9, -7 7, -8 5, 5 4, -1 2, -3 1250 9, 56 9, 48 9, -2 7, -4 6, -7 4, 1 2, -2 13 1300 9, 63 9, 54 9, 3 7, 0 6, -4 4, 3 2, -1 1350 9, 70 9, 60 9, 8 7, 4 6, -1 4, 5 2, 0 14 1400 9, 77 9, 66 9, 13 8, -8 6, 2 5, -7 2, 1 1450 9, 84 9, 72 9, 18 8, -4 6, 5 5, -5 2, 2 15 1500 9, 91 9, 78 9, 23 8, 0 7, -7 5, -3 2, 3 1550 9, 98 9, 84 9, 28 8, 4 7, -4 5, -1 2, 4 16 1600 9,105 9, 90 9, 33 9, -8 7, -1 5, 1 2, 5 1650 9,112 9, 96 9, 38 9, -4 7, 2 5, 3 2, 6 17 1700 9,119 9,102 9, 43 9, 0 7, 5 5, 5 2, 7 1750 9,126 9,108 9, 48 9, 4 8, -7 6, -7 2, 8 18 1800 9,133 9,114 9, 53 9, 8 8, -4 6, -5 3, -9 1850 9,140 9,120 9, 58 9, 12 8, -1 6, -3 3, -8 19 1900 9,147 9,126 9, 63 9, 16 8, 2 6, -1 3, -7 1950 9,154 9,132 9, 68 9, 20 8, 5 6, 1 3, -6 20 2000 9,161 9,138 9, 73 9, 24 9, -7 6, 3 3, -5 2050 9,168 9,144 9, 78 9, 28 9, -4 6, 5 3, -4 21 2100 9,175 9,150 9, 83 9, 32 9, -1 7, -7 3, -3 2150 9,182 9,156 9, 88 9, 36 9, 2 7, -5 3, -2 22 2200 9,189 9,162 9, 93 9, 40 9, 5 7, -3 3, -1 2250 9,196 9,168 9, 98 9, 44 9, 8 7, -1 3, 0 23 2300 9,203 9,174 9,103 9, 48 9, 11 7, 1 3, 1 2350 9,210 9,180 9,108 9, 52 9, 14 7, 3 3, 2 24 2400 9,217 9,186 9,113 9, 56 9, 17 7, 5 3, 3 2450 9,224 9,192 9,118 9, 60 9, 20 8, -7 3, 4 25 2500 9,231 9,198 9,123 9, 64 9, 23 8, -5 3, 5 2550 9,238 9,204 9,128 9, 68 9, 26 8, -3 3, 6 26 2600 9,245 9,210 9,133 9, 72 9, 29 8, -1 3, 7 2650 9,252 9,216 9,138 9, 76 9, 32 8, 1 3, 8 27 2700 9,259 9,222 9,143 9, 80 9, 35 8, 3 4, -9 2750 9,266 9,228 9,148 9, 84 9, 38 8, 5 4, -8 28 2800 9,273 9,234 9,153 9, 88 9, 41 9, -7 4, -7 2850 9,280 9,240 9,158 9, 92 9, 44 9, -5 4, -6 29 2900 9,287 9,246 9,163 9, 96 9, 47 9, -3 4, -5 2950 9,294 9,252 9,168 9,100 9, 50 9, -1 4, -4 30 3000 9,301 9,258 9,173 9,104 9, 53 9, 1 4, -3 3050 9,308 9,264 9,178 9,108 9, 56 9, 3 4, -2 31 3100 9,315 9,270 9,183 9,112 9, 59 9, 5 4, -1 3150 9,322 9,276* 9,188 9,116 9, 62 9, 7 4, 0 32 3200 9,329 9,282* 9,193 9,120 9, 65 9, 9 4, 1 3250 9,336 9,288* 9,198 9,124 9, 68 9, 11 4, 2 33 3300 9,343 9,294* 9,203 9,128 9, 71 9, 13 4, 3 3350 9,350 9,300* 9,208 9,132 9, 74 9, 15 4, 4 34 3400 9,357* 9,306* 9,213 9,136 9, 77 9, 17 4, 5 3450 9,364* 9,312* 9,218 9,140 9, 80 9, 19 4, 6 35 3500 9,371* 9,318* 9,223* 9,144 9, 83 9, 21 4, 7 3550 9,378* 9,324* 9,228* 9,148 9, 86 9, 23 4, 8 36 3600 9,385* 9,330* 9,233* 9,152 9, 89 9, 25 4, 9
* = white wins if no living black stones remain on the board.
Uberdude: You might be interested in http://www.societies.cam.ac.uk/cugos/competitions/sonoyama.html