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S+へ行くまでの険しさ
Twitter:@nico_ac_chi
内容
• ウデマエとは
• 昇格に必要な戦勝数
• この研究では何をする?
• 実験の設定
• 調べること
• 調べ方
• プログラムのフローチャート
• 実験結果
• 確率論からの推察
• 総評(考察)
• 今後
1
ウデマエ
• Splatoon2では、ガチルール別にウデマエが設定されている
• C-,C,C+,B-,B,B+,A-,A,A+,S,S+,(S+0~S+50)
• 勝利⇒メータアップ
• 敗北⇒メータにヒビ
• メータ満タン⇒ウデマエアップ
• メータ割れ ⇒ウデマエ維持、ウデマエ降格
2
昇格に必要な戦勝数の目安
昇格 維持 降格
S以下 10勝7敗 4勝8敗 3勝8敗
*ウデマエメータが0スタートを想定
敵チームとのガチパワー差によりウデマエゲージの増減量は変化する
*webサイト(http://pvpgameblog.com/2017/12/24/post-3805/)を参考
わかること
• 10勝⇒昇格
• 8敗 ⇒ウデマエメータが割れる
• 4勝以上していた⇒ウデマエ維持
• 3勝以下 ⇒ウデマエ降格
3
なにをする?
• How many times does it take matches
to be promoted to S+0 from C-(0)?
(メータが空の状態のウデマエC-からS+0に到達するには、
どれくらいかかるのか)
• 前作に比べ、「2」ではS+に到達することは
どれくらいの難しさなのかを知りたい
• それを試合回数でみる
4
設定
• 一個人としての難しさをみる(主観的)
• 勝率:1/2
• 勝利要因:勝率のみ(武器、ステージ、他プレイヤー、回線切断は非関与)
• ウデマエが上がること、割れることを想定
• ウデマエが変化するとき、飛び級は考慮しない
(勝率1/2であれば、チョウシが著しい値を取らないだろうことから)
5
調べる項目
• C-からS+0に行くのにかかった試合回数
• 勝利数、敗北数の総計
• 昇格回数、ウデマエ維持回数、降格回数の総計
• 各ランクでのメータの更新があったで回数
6
調べ方
1. 「設定」の条件でプログラムを作成し、C-からS+0になるま
での試合回数を調べる(以下、回数調査という)
2. 回数調査を1000回する(以下、調査データという)
3. 代表値を算出(代表値を何にするかは未定)
7
プログラム上でのウデマエ(rank)の設定
変数名 型 変域 備考
rank(ウデマエ) int 1 ≤rank≤ 10 C-,C,…,A+,Sに対応
match int 0 ≤match S+にならない限り1増加
win_sum int 0 ≤win_sum 試合に勝利するたび1増加
lose_sum int 0 ≤lose_sum 試合に敗北するたび1増加
win_rank int 0 ≤win_rank メータが新しくなるまでの勝利数
lose_rank int 0 ≤lose_rank メータが新しくなるまでの敗北数
up int 0 ≤up 昇格回数
down int 0 ≤down 降格回数
keep int 0 ≤keep 維持回数
probability double constant 勝率
rand_pro double 乱数 その試合での勝率値
Change_timing[][] Int
[3][10]
0 ≤change_timing
[][]
そのランクでメータに変化があったときの回数
8
フローチャート
初期設定
• rank←1
win_sum←0
• lose_sum←0
• win_rank←0
• lose_rank←0
• up←0
• down←0
• keep←0
• probability ←1/2
• change_time[][]
←0
開始
ループ①
rand_pro←rand()
probability
<rand_pro
?
yes no
9
※乱数には
シード値を1秒毎
の経過時間とし、
Mersenne
Twisterの方法を
用いる
win_sum++
win_rank++
lose_sum++
lose_rank++
win_rank
==10 ?
• rank++
• up++
• win_rank←0
• lose_rank←0
• change_time
[1][rank]++
lose_rank
==8 ?
• change_time
[2][rank]++
• keep++
• win_rank←0
• lose_rank←0
4≤win_
rank ?
• change_time
[3][rank]++
• rank--
• down++
• win_rank←0
• lose_rank←0
yes
yes noyes
yes no
rank==1?
ループ①
出力
• 総試合数:win_sum+lose_sum
• 総勝利数:win_sum
• 総敗北数:lose_sum
• 昇格回数:up
• 維持回数:keep
• 降格回数:down
• 各ランクでのウデマエの変化回数
終了
10
実験結果
総試合数 総勝利数 総敗北数 昇格回数 維持回数 降格回数
max 1522 749 773 27 67 18
min 255 142 112 9 6 0
ave 611.3625 306.775 304.5875 13.6 24.475 4.6
median 547.5 282 272 12.5 23 3.5
mode 700 150 304 10 9 1
11
表1:回数調査を80回行った各代表値
元データ→
確率論で考えた場合
• 二項分布を用いて確率を考える
• 𝑃 𝑆 𝑛 = 𝑥 =
𝑛
𝑥
𝑝 𝑥 𝑞 𝑛−𝑥
• 𝑝 = 1/2:勝つ確率 𝑞 = 1/2:負ける確率
•
𝑛
𝑥
は組み合わせの数式
12
それぞれの確率(1)
• ウデマエ昇格する確率(⇒9勝かつ7敗以下の後勝ち)
෍
𝑛=1
7
𝑛 + 9
9
1
2
9
1
2
𝑛
×
1
2
= 0.313553 …
• ウデマエ降格する確率(⇒3勝以下、7敗の後負け)
෍
𝑛=1
3
𝑛 + 7
7
1
2
𝑛
1
2
7
×
1
2
= 0.109375 …
• ウデマエ維持する確率(⇒4勝以上9勝以下、7敗の後負け)
෍
𝑛=4
9
𝑛 + 7
7
1
2
𝑛
1
2
7
×
1
2
= 0.572189 …
Excelで数値を算出
13
それぞれの確率(2)
戦勝数𝑥
𝑛
𝑥
𝑝 𝑥−1 𝑞 𝑛−𝑥
𝑝 確率
1 10 0.001953 0.5 0.5 0.004883
2 55 0.001953 0.25 0.5 0.013428
3 220 0.001953 0.125 0.5 0.026855
4 715 0.001953 0.0625 0.5 0.04364
5 2002 0.001953 0.03125 0.5 0.061096
6 5005 0.001953 0.015625 0.5 0.07637
7 11440 0.001953 0.007813 0.5 0.08728
sum 0.313553
ウデマエ昇格する確率:0.313553
ウデマエ降格する確率: 0.109375
戦勝数𝑥
𝑛
𝑥
𝑝 𝑥
𝑞(𝑛−1)−𝑥 𝑞 確率
1 8 0.5 0.007813 0.5 0.015625
2 36 0.25 0.007813 0.5 0.035156
3 120 0.125 0.007813 0.5 0.058594
sum 0.109375
ウデマエ維持する確率: 0.572189
戦勝数𝑥
𝑛
𝑥
𝑝 𝑥
𝑞(𝑛−1)−𝑥 𝑞 確率
4 330 0.0625 0.007813 0.5 0.080566
5 792 0.03125 0.007813 0.5 0.09668
6 1716 0.015625 0.007813 0.5 0.104736
7 3432 0.007813 0.007813 0.5 0.104736
8 6435 0.003906 0.007813 0.5 0.09819
9 11440 0.001953 0.007813 0.5 0.08728
sum 0.572189
全ての確立の和
昇格 降格 維持 合計
0.313553 0.109375 0.572189 0.995117
※全事象の確立が1にならないのは
Excel計算の小数点以下の下位の桁落ちのため14
考察
• 実験から
• 平均値でみたとき
昇格回数:維持回数:降格回数の割合は
3 : 5.7 : 1
• S+に到達達することは難しいとは言い難い
• 確率論から
• 昇格する確率>降格する確率
• (昇格する確率+維持する確率)> 0.5
• S+に到達することは難しいとは言い難い
15
今後
• 勝率をほかの値に固定したときはどうなるか
• Twitter「スプラトゥーン研究所」アカウントの勝率を参考に
各試合で勝率を変化させた場合はどうか
16

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S+へ行くまでの険しさ