Scrabble Movegen Performance Dashboard

Shadow vs NoShadow Comparison | Generated: 2026-01-26 22:20:24 | 50 games per variant

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Hybrid Strategy Recommendation

Use NoShadow for 0 blanks (faster by ~15-20%). Switch to Shadow for 1+ blanks (faster by 20-130%). The crossover point is clear: blanks multiply the search space exponentially, making Shadow's precomputation worthwhile.

Note: More granular filters (vowel/consonant counts, leave values, S presence) were analyzed but showed no consistent signal beyond blank count. The V/C/B breakdown tables are provided below for reference but the hybrid decision should use only blank count.

Overall Hybrid Performance (Actual)

Shadow Only
321.5 frames
NoShadow Only
358.8 frames
Hybrid (Actual)
300.2 frames

Hybrid improves on Shadow-only by 7.1% and on NoShadow-only by 19.5% across 2239 moves.

NWL23
CSW24
Shadow Mean
308.2
NoShadow Mean
332.6
Hybrid (Actual)
285.8
Hybrid vs Shadow
1.08x
Hybrid vs NoShadow
1.16x

By Blank Count

CategoryCountShadow MeanShadow MedShadow MaxNoShadow MeanNoShadow MedNoShadow MaxWinnerSpeedupHybrid
0 blanks 987 169.3 159.0 583 143.6 126.0 640 NoShadow
1.18x		 143.2
1 blank 159 1153.6 1064.0 3057 1398.6 1252.0 4354 Shadow
1.21x		 1153.7
2 blanks 2 1639.5 1953.0 1953 8842.0 13577.0 13577 Shadow
5.39x		 1639.5

By Rack Composition (Vowels/Consonants/Blanks)

CategoryCountShadow MeanShadow MedShadow MaxNoShadow MeanNoShadow MedNoShadow MaxWinnerSpeedupHybrid
0/1/0 8 18.5 20.0 22 12.1 12.0 13 NoShadow
1.53x		 12.4
0/2/0 11 35.6 36.0 47 15.4 16.0 18 NoShadow
2.32x		 15.4
0/3/0 7 55.4 52.0 67 21.0 22.0 28 NoShadow
2.64x		 21.1
0/7/0 8 92.8 103.0 122 60.4 57.0 92 NoShadow
1.54x		 59.5
1/1/0 5 38.2 41.0 43 18.6 18.0 23 NoShadow
2.05x		 18.6
1/2/0 8 56.4 57.0 66 25.0 25.0 34 NoShadow
2.25x		 25.1
1/6/0 99 136.1 136.0 237 102.4 100.0 197 NoShadow
1.33x		 101.9
2/5/0 238 181.8 168.0 531 155.4 137.0 512 NoShadow
1.17x		 155.1
3/3/0 5 164.4 167.0 243 115.0 106.0 176 NoShadow
1.43x		 115.6
3/4/0 290 197.0 183.0 542 180.4 162.0 547 NoShadow
1.09x		 179.9
4/3/0 188 181.5 163.0 583 155.5 131.0 640 NoShadow
1.17x		 155.0
5/2/0 66 162.4 158.0 378 124.8 115.0 343 NoShadow
1.30x		 124.3
6/1/0 18 128.8 127.0 272 88.0 74.0 225 NoShadow
1.46x		 87.5
0/6/1 5 667.0 633.0 892 702.8 604.0 907 Shadow
1.05x		 666.8
1/5/1 22 1131.0 1106.0 2231 1187.4 1192.0 2195 -
1.05x		 1131.0
2/4/1 59 1223.1 1107.0 3057 1505.9 1343.0 4354 Shadow
1.23x		 1223.3
3/3/1 46 1152.6 1064.0 2740 1527.4 1301.0 3972 Shadow
1.33x		 1152.7
4/2/1 21 1173.2 1067.0 2290 1341.1 1214.0 3674 Shadow
1.14x		 1173.4
5/1/1 5 986.8 1089.0 1925 966.0 1039.0 1950 -
1.02x		 987.2

By Average 6-Tile Leave (7-tile racks)

Leave range: -31.4 to 42.5 points

CategoryCountShadow MeanShadow MedShadow MaxNoShadow MeanNoShadow MedNoShadow MaxWinnerSpeedupHybrid
-27.5 to -25.0 4 107.2 103.0 162 73.2 62.0 129 NoShadow
1.46x		 72.8
-25.0 to -22.5 7 121.9 123.0 202 79.7 73.0 137 NoShadow
1.53x		 78.9
-22.5 to -20.0 11 132.6 127.0 226 88.6 79.0 165 NoShadow
1.50x		 88.3
-20.0 to -17.5 17 110.7 121.0 159 75.3 67.0 127 NoShadow
1.47x		 74.8
-17.5 to -15.0 33 132.2 133.0 349 95.8 81.0 329 NoShadow
1.38x		 95.3
-15.0 to -12.5 43 120.1 129.0 221 86.6 83.0 167 NoShadow
1.39x		 85.9
-12.5 to -10.0 56 152.6 158.0 368 118.3 116.0 302 NoShadow
1.29x		 117.9
-10.0 to -7.5 69 145.2 148.0 301 109.4 105.0 274 NoShadow
1.33x		 109.0
-7.5 to -5.0 88 158.5 149.0 343 122.8 107.0 338 NoShadow
1.29x		 122.4
-5.0 to -2.5 84 161.5 152.0 378 132.4 124.0 343 NoShadow
1.22x		 131.9
-2.5 to 0.0 83 171.3 164.0 583 142.6 127.0 557 NoShadow
1.20x		 142.1
0.0 to 2.5 79 180.7 183.0 352 157.5 147.0 364 NoShadow
1.15x		 157.1
2.5 to 5.0 89 203.1 187.0 918 177.6 173.0 890 NoShadow
1.14x		 178.0
5.0 to 7.5 52 235.1 190.0 1089 216.7 168.0 1039 NoShadow
1.09x		 218.8
7.5 to 10.0 50 220.1 189.0 892 198.9 175.0 855 NoShadow
1.11x		 199.3
10.0 to 12.5 44 278.4 232.0 1204 262.9 211.0 1214 NoShadow
1.06x		 261.4
12.5 to 15.0 48 339.1 261.0 1359 332.7 224.0 1504 -
1.02x		 330.8
15.0 to 17.5 33 444.4 297.0 1925 440.1 273.0 1950 -
1.01x		 434.1
17.5 to 20.0 33 648.6 386.0 1756 635.2 401.0 1700 -
1.02x		 647.4
20.0 to 22.5 33 758.9 570.0 2290 890.3 682.0 3009 Shadow
1.17x		 775.9
22.5 to 25.0 22 910.7 513.0 2475 992.1 786.0 2450 Shadow
1.09x		 929.9
25.0 to 27.5 17 1086.7 1067.0 1991 1401.8 1506.0 3674 Shadow
1.29x		 1092.3
27.5 to 30.0 20 1087.2 1064.0 2234 1248.7 1081.0 2851 Shadow
1.15x		 1092.8
30.0 to 32.5 15 1254.7 1298.0 2624 1576.1 1419.0 3219 Shadow
1.26x		 1254.9
32.5 to 35.0 13 1657.5 1389.0 3057 2247.5 1849.0 3972 Shadow
1.36x		 1657.7
35.0 to 37.5 8 1430.6 1624.0 2815 2357.5 2106.0 4354 Shadow
1.65x		 1430.9
37.5 to 40.0 10 1159.5 1018.0 2810 2960.9 1885.0 13577 Shadow
2.55x		 1159.6
Shadow Mean
335.4
NoShadow Mean
386.4
Hybrid (Actual)
315.3
Hybrid vs Shadow
1.06x
Hybrid vs NoShadow
1.23x

By Blank Count

CategoryCountShadow MeanShadow MedShadow MaxNoShadow MeanNoShadow MedNoShadow MaxWinnerSpeedupHybrid
0 blanks 946 186.8 173.0 725 164.0 143.0 724 NoShadow
1.14x		 163.6
1 blank 143 1271.6 1134.0 3888 1803.6 1448.0 5936 Shadow
1.42x		 1271.8
2 blanks 2 3705.5 4313.0 4313 4253.0 5431.0 5431 Shadow
1.15x		 3705.0

By Rack Composition (Vowels/Consonants/Blanks)

CategoryCountShadow MeanShadow MedShadow MaxNoShadow MeanNoShadow MedNoShadow MaxWinnerSpeedupHybrid
0/2/0 7 35.4 35.0 43 16.1 17.0 19 NoShadow
2.19x		 16.1
0/7/0 14 107.4 115.0 147 68.3 72.0 105 NoShadow
1.57x		 68.1
1/0/0 10 20.2 20.0 27 13.7 13.0 17 NoShadow
1.47x		 13.8
1/2/0 6 64.3 68.0 73 28.7 28.0 33 NoShadow
2.24x		 28.7
1/6/0 102 151.7 150.0 281 115.4 114.0 254 NoShadow
1.31x		 114.7
2/5/0 224 196.9 188.0 423 170.4 152.0 430 NoShadow
1.16x		 169.9
3/4/0 278 214.8 200.0 725 201.5 177.0 724 NoShadow
1.07x		 201.1
4/3/0 182 206.3 184.0 632 190.9 161.0 636 NoShadow
1.08x		 190.4
5/2/0 74 181.8 171.0 454 143.9 129.0 425 NoShadow
1.26x		 143.5
6/1/0 12 116.2 103.0 207 74.1 66.0 147 NoShadow
1.57x		 73.8
1/5/1 16 1095.8 1137.0 1667 1352.9 1408.0 2000 Shadow
1.23x		 1096.2
2/4/1 54 1232.6 1171.0 3350 1819.5 1623.0 4508 Shadow
1.48x		 1232.8
3/3/1 45 1502.8 1304.0 3888 2211.2 1843.0 5936 Shadow
1.47x		 1503.0
4/2/1 19 1285.2 1106.0 2872 1704.3 1395.0 4754 Shadow
1.33x		 1285.1

By Average 6-Tile Leave (7-tile racks)

Leave range: -32.1 to 61.9 points

CategoryCountShadow MeanShadow MedShadow MaxNoShadow MeanNoShadow MedNoShadow MaxWinnerSpeedupHybrid
-30.0 to -27.5 3 92.7 64.0 158 53.7 45.0 78 NoShadow
1.73x		 53.7
-27.5 to -25.0 9 117.1 115.0 146 79.0 72.0 108 NoShadow
1.48x		 78.2
-25.0 to -22.5 9 108.2 114.0 165 67.4 66.0 112 NoShadow
1.60x		 66.9
-22.5 to -20.0 9 130.7 136.0 207 88.6 81.0 147 NoShadow
1.48x		 88.4
-20.0 to -17.5 25 134.8 128.0 261 95.9 97.0 211 NoShadow
1.41x		 95.4
-17.5 to -15.0 32 142.0 142.0 284 105.8 105.0 224 NoShadow
1.34x		 105.2
-15.0 to -12.5 42 154.8 156.0 319 116.2 110.0 280 NoShadow
1.33x		 115.8
-12.5 to -10.0 58 171.4 175.0 322 135.0 135.0 286 NoShadow
1.27x		 134.5
-10.0 to -7.5 68 168.8 164.0 335 133.1 119.0 296 NoShadow
1.27x		 132.6
-7.5 to -5.0 84 178.1 174.0 454 149.6 148.0 425 NoShadow
1.19x		 149.1
-5.0 to -2.5 79 193.3 178.0 444 169.1 143.0 442 NoShadow
1.14x		 168.5
-2.5 to 0.0 102 204.1 196.0 632 176.3 155.0 636 NoShadow
1.16x		 176.2
0.0 to 2.5 62 207.5 208.0 420 186.1 176.0 421 NoShadow
1.11x		 185.7
2.5 to 5.0 67 239.0 200.0 1477 211.1 164.0 1418 NoShadow
1.13x		 211.6
5.0 to 7.5 58 253.1 212.0 1019 227.9 177.0 949 NoShadow
1.11x		 229.9
7.5 to 10.0 59 216.5 214.0 645 203.7 185.0 665 NoShadow
1.06x		 204.2
10.0 to 12.5 39 249.6 228.0 547 245.6 212.0 577 -
1.02x		 246.5
12.5 to 15.0 25 414.2 272.0 1258 455.6 325.0 1651 Shadow
1.10x		 426.4
15.0 to 17.5 36 488.1 313.0 1667 493.8 301.0 1721 -
1.01x		 490.3
17.5 to 20.0 29 605.9 294.0 3350 616.1 288.0 3286 -
1.02x		 609.7
20.0 to 22.5 27 995.9 810.0 3005 1125.9 817.0 3529 Shadow
1.13x		 1018.0
22.5 to 25.0 20 802.9 623.0 2396 1097.0 1009.0 2857 Shadow
1.37x		 828.2
25.0 to 27.5 26 1164.5 923.0 3767 1623.9 1258.0 4754 Shadow
1.39x		 1173.1
27.5 to 30.0 11 1578.9 1244.0 4313 2216.2 1843.0 5431 Shadow
1.40x		 1587.7
30.0 to 32.5 18 1384.8 1359.0 3888 2294.6 2018.0 4508 Shadow
1.66x		 1385.2
32.5 to 35.0 8 1248.0 1276.0 2511 2450.0 2675.0 3693 Shadow
1.96x		 1248.2
35.0 to 37.5 6 1719.0 2243.0 2989 2619.0 3149.0 5936 Shadow
1.52x		 1719.3
37.5 to 40.0 9 1341.8 1185.0 3863 2649.3 2221.0 5710 Shadow
1.97x		 1341.9
40.0 to 42.5 3 1768.0 1800.0 2200 3752.3 3384.0 5472 Shadow
2.12x		 1768.0