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TRPGが好きっ!.com > アナログゲーム > TRPGコラム > 確率の話 > 確率の話(D6系)

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確率の話(D6系)

1D6〜10D6の出目合計(出現率)

1D62D63D64D65D66D67D68D69D610D6
116.667%---------
216.667%2.778%--------
316.667%5.556%0.463%-------
416.667%8.333%1.389%0.077%------
516.667%11.111%2.778%0.309%0.013%-----
616.667%13.889%4.630%0.772%0.064%0.002%----
7-16.667%6.944%1.543%0.193%0.013%0.000%---
8-13.889%9.722%2.701%0.450%0.045%0.003%0.000%--
9-11.111%11.574%4.321%0.900%0.120%0.010%0.000%0.000%-
10-8.333%12.5%6.173%1.620%0.270%0.030%0.002%0.000%0.000%
11-5.556%12.5%8.025%2.636%0.540%0.075%0.007%0.000%0.000%
12-2.778%11.574%9.645%3.922%0.977%0.165%0.020%0.002%0.000%
13--9.722%10.802%5.401%1.620%0.328%0.047%0.005%0.000%
14--6.944%11.265%6.944%2.488%0.595%0.102%0.013%0.001%
15--4.630%10.802%8.372%3.571%1.003%0.201%0.030%0.003%
16--2.778%9.645%9.452%4.816%1.578%0.366%0.063%0.008%
17--1.389%8.025%10.031%6.121%2.336%0.624%0.124%0.019%
18--0.463%6.173%10.031%7.354%3.266%1.001%0.226%0.039%
19---4.321%9.452%8.372%4.328%1.517%0.390%0.077%
20---2.701%8.372%9.047%5.454%2.184%0.635%0.141%
21---1.543%6.944%9.285%6.547%2.994%0.982%0.245%
22---0.772%5.401%9.047%7.499%3.918%1.448%0.403%
23---0.309%3.922%8.372%8.204%4.905%2.040%0.634%
24---0.077%2.636%7.354%8.579%5.883%2.753%0.954%
25----1.620%6.121%8.579%6.769%3.567%1.375%
26----0.900%4.816%8.204%7.477%4.442%1.904%
27----0.450%3.571%7.499%7.936%5.324%2.539%
28----0.193%2.488%6.547%8.094%6.148%3.262%
29----0.064%1.620%5.454%7.936%6.844%4.046%
30----0.013%0.977%4.328%7.477%7.349%4.846%
31-----0.540%3.266%6.769%7.615%5.612%
32-----0.270%2.336%5.883%7.615%6.287%
33-----0.120%1.578%4.905%7.349%6.816%
34-----0.045%1.003%3.918%6.844%7.153%
35-----0.013%0.595%2.994%6.148%7.269%
36-----0.002%0.328%2.184%5.324%7.153%
37------0.165%1.517%4.442%6.816%
38------0.075%1.001%3.567%6.287%
39------0.030%0.624%2.753%5.612%
40------0.010%0.366%2.040%4.846%
41------0.003%0.201%1.448%4.046%
42------0.000%0.102%0.982%3.262%
43-------0.047%0.635%2.539%
44-------0.020%0.390%1.904%
45-------0.007%0.226%1.375%
46-------0.002%0.124%0.954%
47-------0.000%0.063%0.634%
48-------0.000%0.030%0.403%
49--------0.013%0.245%
50--------0.005%0.141%
51--------0.002%0.077%
52--------0.000%0.039%
53--------0.000%0.019%
54--------0.000%0.008%
55---------0.003%
56---------0.001%
57---------0.000%
58---------0.000%
59---------0.000%
60---------0.000%

1D6〜10D6の出目合計(以下が出る確率)

1D62D63D64D65D66D67D68D69D610D6
1以下16.667%---------
2以下33.333%2.778%--------
3以下50%8.333%0.463%-------
4以下66.667%16.667%1.852%0.077%------
5以下83.333%27.778%4.630%0.386%0.013%-----
6以下100%41.667%9.259%1.157%0.077%0.002%----
7以下-58.333%16.204%2.701%0.270%0.015%0.000%---
8以下-72.222%25.926%5.401%0.720%0.060%0.003%0.000%--
9以下-83.333%37.5%9.722%1.620%0.180%0.013%0.001%0.000%-
10以下-91.667%50%15.895%3.241%0.450%0.043%0.003%0.000%0.000%
11以下-97.222%62.5%23.920%5.877%0.990%0.118%0.010%0.001%0.000%
12以下-100%74.074%33.565%9.799%1.968%0.283%0.029%0.002%0.000%
13以下--83.796%44.367%15.201%3.588%0.610%0.077%0.007%0.000%
14以下--90.741%55.633%22.145%6.076%1.206%0.178%0.020%0.002%
15以下--95.370%66.435%30.517%9.647%2.209%0.379%0.050%0.005%
16以下--98.148%76.080%39.969%14.463%3.787%0.745%0.113%0.013%
17以下--99.537%84.105%50%20.585%6.122%1.369%0.236%0.032%
18以下--100%90.278%60.031%27.939%9.388%2.369%0.463%0.071%
19以下---94.599%69.483%36.310%13.716%3.887%0.853%0.148%
20以下---97.299%77.855%45.358%19.170%6.071%1.488%0.289%
21以下---98.843%84.799%54.642%25.717%9.065%2.470%0.534%
22以下---99.614%90.201%63.690%33.216%12.983%3.918%0.937%
23以下---99.923%94.123%72.061%41.421%17.888%5.958%1.571%
24以下---100%96.759%79.415%50%23.771%8.711%2.525%
25以下----98.380%85.537%58.579%30.540%12.278%3.899%
26以下----99.280%90.353%66.784%38.017%16.720%5.804%
27以下----99.730%93.924%74.283%45.953%22.044%8.342%
28以下----99.923%96.412%80.830%54.047%28.192%11.605%
29以下----99.987%98.032%86.284%61.983%35.036%15.650%
30以下----100%99.010%90.612%69.460%42.385%20.497%
31以下-----99.550%93.878%76.229%50%26.109%
32以下-----99.820%96.213%82.112%57.615%32.396%
33以下-----99.940%97.791%87.017%64.964%39.212%
34以下-----99.985%98.794%90.935%71.808%46.365%
35以下-----99.998%99.390%93.929%77.956%53.635%
36以下-----100%99.717%96.113%83.280%60.788%
37以下------99.882%97.631%87.722%67.604%
38以下------99.957%98.631%91.289%73.891%
39以下------99.987%99.255%94.042%79.503%
40以下------99.997%99.621%96.082%84.350%
41以下------100.000%99.822%97.530%88.395%
42以下------100%99.923%98.512%91.658%
43以下-------99.971%99.147%94.196%
44以下-------99.990%99.537%96.101%
45以下-------99.997%99.764%97.475%
46以下-------99.999%99.887%98.429%
47以下-------100.000%99.950%99.063%
48以下-------100%99.980%99.466%
49以下--------99.993%99.711%
50以下--------99.998%99.852%
51以下--------99.999%99.929%
52以下--------100.000%99.968%
53以下--------100.000%99.987%
54以下--------100%99.995%
55以下---------99.998%
56以下---------100.000%
57以下---------100.000%
58以下---------100.000%
59以下---------100.000%
60以下---------100%

6の目がn個出る確率

EXCEL数式=5^(ダイス数-出現数)*COMBIN(ダイス数,出現数)

個数0個1個2個3個4個5個6個7個8個9個10個
1D683.333%16.667%---------
2D669.444%27.778%2.778%--------
3D657.870%34.722%6.944%0.463%-------
4D648.225%38.580%11.574%1.543%0.077%------
5D640.188%40.188%16.075%3.215%0.322%0.013%-----
6D633.490%40.188%20.094%5.358%0.804%0.064%0.002%----
7D627.908%39.071%23.443%7.814%1.563%0.188%0.013%0.000%---
8D623.257%37.211%26.048%10.419%2.605%0.417%0.042%0.002%0.000%--
9D619.381%34.885%27.908%13.024%3.907%0.781%0.104%0.009%0.000%0.000%-
10D616.151%32.301%29.071%15.505%5.427%1.302%0.217%0.025%0.002%0.000%0.000%

6の目がn個以上出る確率

 「アリアンロッドRPG」「MAGIUS」などの、6が2個以上出るとクリティカル、というゲームなどでの確率を求めるときに役立つと思います。

個数1個以上2個以上3個以上4個以上5個以上6個以上7個以上8個以上9個以上10個以上
1D616.667%---------
2D630.556%2.778%--------
3D642.130%7.407%0.463%-------
4D651.775%13.194%1.620%0.077%------
5D659.812%19.624%3.549%0.334%0.013%-----
6D666.510%26.322%6.229%0.870%0.066%0.002%----
7D672.092%33.020%9.578%1.763%0.200%0.013%0.000%---
8D676.743%39.532%13.485%3.066%0.461%0.044%0.002%0.000%--
9D680.619%45.734%17.826%4.802%0.895%0.114%0.009%0.000%0.000%-
10D683.849%51.548%22.477%6.973%1.546%0.244%0.027%0.002%0.000%0.000%

デモンパラサイトのクリティカル率とファンブル率

 出目1が2個以上出るとファンブル、ファンブル条件を満たさずに出目6が2個以上出るとクリティカルです。ルール上、ダイスを7個以上ふることはないはずです。

ダイス数クリティカル率ファンブル率どちらも発生しない率
2D62.778%2.778%94.444%
3D67.407%7.407%85.185%
4D612.731%13.194%74.074%
5D617.824%19.624%62.551%
6D622.100%26.322%51.578%

3D6を振って高い出目2つを採用する場合

 MAGIUSなどで使えると思います。
 ちなみに期待値は8.458です。

出目出現率以下が出る率
20.463%0.463%
31.389%1.852%
43.241%5.093%
55.556%10.648%
68.796%19.444%
712.5%31.944%
815.741%47.685%
916.667%64.352%
1015.741%80.093%
1112.5%92.593%
127.407%100%

2D6 vs 2D6 勝敗率表

 まず2D6の確率分布を縦横に広げてかけ算し、比較用のテーブルを作ります。この確率分布テーブルを作り変えれば、別のダイスでも同じ手法で勝敗率表を作れます。

出目防御23456789101112
攻撃出現率12345654321
2112345654321
3224681012108642
433691215181512963
54481216202420161284
6551015202530252015105
7661218243036302418126
8551015202530252015105
94481216202420161284
1033691215181512963
11224681012108642
12112345654321

 後は「差が0になる部分を全部足し算」「攻撃側が1差で勝つ確率を全部足し算」すれば、基本的な確率は求められます。例えば2D6同士の差は4D6の出目と同じ分布になります。
 ただし、大抵のゲームにはクリティカルとファンブル、つまり「出目の差に関係なく成功、または失敗する組み合わせ」があります。なので、その部分だけを別表で計算すればいいわけです。
 なお、引き分けについては「防御側有利」「攻撃側有利」「双方譲らず」など、ゲームによって裁定の仕方が違うので、各システムのルールを参照してください。

攻撃\防御ファンブル普通の目クリティカル
ファンブル引き分け敗北敗北
普通の目勝利出目を比較敗北
クリティカル勝利勝利引き分け

 なお、これ以降クリティカルをC、ファンブルをFと表記します。
 最初の表はソード・ワールドなどで、次以降の表はSRSなどで参考にできると思います。

攻撃:C12・F2、防御:C12・F2

実力差勝利敗北引き分け
攻 +9 > 防94.522%5.324%0.154%
攻 +8 > 防94.213%5.324%0.463%
攻 +7 > 防93.287%5.633%1.080%
攻 +6 > 防91.358%6.559%2.083%
攻 +5 > 防87.963%8.488%3.549%
攻 +4 > 防82.562%11.883%5.556%
攻 +3 > 防75.154%17.284%7.562%
攻 +2 > 防65.972%24.691%9.336%
攻 +1 > 防55.478%33.873%10.648%
(±0)=防44.367%44.367%11.265%
攻 -1 < 防33.873%55.478%10.648%
攻 -2 < 防24.691%65.972%9.336%
攻 -3 < 防17.284%75.154%7.562%
攻 -4 < 防11.883%82.562%5.556%
攻 -5 < 防8.488%87.963%3.549%
攻 -6 < 防6.559%91.358%2.083%
攻 -7 < 防5.633%93.287%1.080%
攻 -8 < 防5.324%94.213%0.463%
攻 -9 < 防5.324%94.522%0.154%

攻撃:C11・F2、防御:C12・F2

実力差勝利敗北引き分け
攻 +9 > 防94.522%5.170%0.309%
攻 +8 > 防94.213%5.170%0.617%
攻 +7 > 防93.287%5.478%1.235%
攻 +6 > 防91.358%6.404%2.238%
攻 +5 > 防87.963%8.333%3.704%
攻 +4 > 防82.562%11.728%5.710%
攻 +3 > 防75.154%17.130%7.716%
攻 +2 > 防65.972%24.537%9.491%
攻 +1 > 防55.478%33.719%10.802%
(±0)=防44.676%44.213%11.111%
攻 -1 < 防34.645%55.015%10.340%
攻 -2 < 防26.080%65.046%8.873%
攻 -3 < 防19.444%73.611%6.944%
攻 -4 < 防14.969%80.247%4.784%
攻 -5 < 防12.346%84.722%2.932%
攻 -6 < 防11.034%87.346%1.620%
攻 -7 < 防10.571%88.657%0.772%
攻 -8 < 防10.571%89.120%0.309%

攻撃:C10・F2、防御:C12・F2

実力差勝利敗北引き分け
攻 +9 > 防94.522%4.938%0.540%
攻 +8 > 防94.213%4.938%0.849%
攻 +7 > 防93.287%5.247%1.466%
攻 +6 > 防91.358%6.173%2.469%
攻 +5 > 防87.963%8.102%3.935%
攻 +4 > 防82.562%11.497%5.941%
攻 +3 > 防75.154%16.898%7.948%
攻 +2 > 防65.972%24.306%9.722%
攻 +1 > 防55.941%33.488%10.571%
(±0)=防45.833%43.519%10.648%
攻 -1 < 防36.728%53.627%9.645%
攻 -2 < 防29.321%62.731%7.948%
攻 -3 < 防24.074%70.139%5.787%
攻 -4 < 防20.756%75.386%3.858%
攻 -5 < 防19.059%78.704%2.238%
攻 -6 < 防18.441%80.401%1.157%
攻 -7 < 防18.441%81.019%0.540%

攻撃:C9・F2、防御:C12・F2

実力差勝利敗北引き分け
攻 +9 > 防94.522%4.707%0.772%
攻 +8 > 防94.213%4.707%1.080%
攻 +7 > 防93.287%5.015%1.698%
攻 +6 > 防91.358%5.941%2.701%
攻 +5 > 防87.963%7.870%4.167%
攻 +4 > 防82.562%11.265%6.173%
攻 +3 > 防75.154%16.667%8.179%
攻 +2 > 防66.590%24.074%9.336%
攻 +1 > 防57.485%32.639%9.877%
(±0)=防48.611%41.744%9.645%
攻 -1 < 防41.049%50.617%8.333%
攻 -2 < 防35.494%58.179%6.327%
攻 -3 < 防31.790%63.735%4.475%
攻 -4 < 防29.707%67.438%2.855%
攻 -5 < 防28.935%69.522%1.543%
攻 -6 < 防28.935%70.293%0.772%

攻撃:C11・F3、防御:C12・F2

実力差勝利敗北引き分け
攻 +8 > 防89.120%10.417%0.463%
攻 +7 > 防88.657%10.417%0.926%
攻 +6 > 防87.346%10.880%1.775%
攻 +5 > 防84.722%12.191%3.086%
攻 +4 > 防80.247%14.815%4.938%
攻 +3 > 防73.611%19.290%7.099%
攻 +2 > 防65.046%25.926%9.028%
攻 +1 > 防55.015%34.491%10.494%
(±0)=防44.522%44.522%10.957%
攻 -1 < 防34.491%55.015%10.494%
攻 -2 < 防25.926%65.046%9.028%
攻 -3 < 防19.290%73.611%7.099%
攻 -4 < 防14.815%80.247%4.938%
攻 -5 < 防12.191%84.722%3.086%
攻 -6 < 防10.880%87.346%1.775%
攻 -7 < 防10.417%88.657%0.926%
攻 -8 < 防10.417%89.120%0.463%

攻撃:C10・F3、防御:C12・F2

実力差勝利敗北引き分け
攻 +8 > 防89.120%10.185%0.694%
攻 +7 > 防88.657%10.185%1.157%
攻 +6 > 防87.346%10.648%2.006%
攻 +5 > 防84.722%11.960%3.318%
攻 +4 > 防80.247%14.583%5.170%
攻 +3 > 防73.611%19.059%7.330%
攻 +2 > 防65.046%25.694%9.259%
攻 +1 > 防55.478%34.259%10.262%
(±0)=防45.679%43.827%10.494%
攻 -1 < 防36.574%53.627%9.799%
攻 -2 < 防29.167%62.731%8.102%
攻 -3 < 防23.920%70.139%5.941%
攻 -4 < 防20.602%75.386%4.012%
攻 -5 < 防18.904%78.704%2.392%
攻 -6 < 防18.287%80.401%1.312%
攻 -7 < 防18.287%81.019%0.694%

攻撃:C9・F3、防御:C12・F2

実力差勝利敗北引き分け
攻 +8 > 防89.120%9.954%0.926%
攻 +7 > 防88.657%9.954%1.389%
攻 +6 > 防87.346%10.417%2.238%
攻 +5 > 防84.722%11.728%3.549%
攻 +4 > 防80.247%14.352%5.401%
攻 +3 > 防73.611%18.827%7.562%
攻 +2 > 防65.664%25.463%8.873%
攻 +1 > 防57.022%33.410%9.568%
(±0)=防48.457%42.052%9.491%
攻 -1 < 防40.895%50.617%8.488%
攻 -2 < 防35.340%58.179%6.481%
攻 -3 < 防31.636%63.735%4.630%
攻 -4 < 防29.552%67.438%3.009%
攻 -5 < 防28.781%69.522%1.698%
攻 -6 < 防28.781%70.293%0.926%

人事を尽くして天命を待つ。

[最終更新日 2011.4.19]   [▲ ページトップへ ▲]

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