ガイド
各ゲームに10本のガイド。最初の一手から、競り合いを決める習慣まで。
チェス
完全なルール、読みを入れる相手、そして読み返せる棋譜。
本当に効くチェスの序盤原則You do not need to memorise opening theory to get a decent position. Three ideas — centre, development, king safety — will carry y…
8 minフォーク・ピン・スキュア：勝敗を決める戦術Nearly every game below master level is settled by a two-move tactic. These are the four patterns worth drilling until you see the…
9 min即座に見抜きたい八つのメイト形Mate almost always arrives in one of a handful of shapes. Learn the shapes and you stop calculating from scratch every time.…
8 minチェスの終盤：誰もが知るべき五つの局面Endgames feel dry until you lose a won game. These five positions cover most of what actually comes up, and none of them takes lon…
9 min駒をただで渡さなくなるにはMost lost games are not lost to brilliance. They are given away in one move. Here is a routine that removes the majority of those …
7 minキャスリング・アンパッサン・プロモーションを正しくThree rules that confuse more new players than everything else combined — including the exact conditions people usually get wrong.…
7 minチェスエンジンとの対局を上達に変えるA computer opponent is a training tool, not just a rival. Used well it fixes weaknesses fast; used badly it teaches you to play sc…
7 minチェスが引き分けになるすべての形Half points come from five different rules, and knowing them turns lost positions into saves — and stops won positions slipping aw…
7 minポーン構造：局面の骨格Pawns are the slowest pieces and the ones that decide where every other piece belongs. Six structures explain most middlegame plan…
8 min初心者からクラブ級までの現実的な学習計画What to work on, in what order, and how much of each — for players who have the rules down and want to stop losing to the same thi…
8 min棋譜の読み方と対局の追い方Algebraic notation takes ten minutes to learn and unlocks every chess book, video and database ever made.…
6 min数独
その場で生成し、解が一つであることを確認。ヒントは理由まで説明します。
スキャン：どんな数独でも最速で入る方法Before you write a single pencil mark, scanning will usually fill a third of the grid. Here is how to do it systematically instead…
6 minメモ：いつ使い、どう整理するかCandidates turn a memory problem into a visible one. Used carelessly they turn a solvable puzzle into a mess.…
6 min裸と隠れのペア・トリプル・クアッドThe first real technique beyond singles, and the one that unlocks most hard puzzles. The idea is simpler than the names suggest.…
7 minX-Wing、ソードフィッシュ、ペアの先の手筋When singles, pairs and locked candidates all run out, these are the next techniques — and the logic is more approachable than the…
7 min数独を台無しにする七つのミスMost failed puzzles are not too hard. They are broken by a small error twenty moves earlier.…
6 minミスを増やさずに数独を速く解くSpeed comes from cutting wasted looking, not from thinking quicker. Six changes that shorten solve times immediately.…
6 min数独の難しさは何で決まるのかIt is not the number of clues. Difficulty comes from which techniques are required and where the clues are placed.…
6 min本当に上達する数独の練習メニューSolving more puzzles is not the same as getting better. Twenty focused minutes a day beats an hour of the same thing repeated.…
6 min紙で数独を解くと何が変わるかPaper is slower, harder and better for learning some things. Here is how to adapt, and how to print a grid from this site.…
5 min数独のバリエーションと試す価値のあるものKiller, jigsaw, diagonal, hyper — the popular variants change one rule each, and each change rewards a different kind of thinking.…
6 min囲碁
アタリ・コウ・パス・地の計算に対応。9路、13路、19路。
ダメ・アタリ・取り：囲碁の戦いの力学Every fight in go is a race to fill liberties. Counting them turns guesswork into arithmetic.…
6 min二眼：石はどう生き、どう死ぬかA group with two eyes cannot be captured, ever. Everything else in go is a negotiation about whether a group can get there.…
7 min9路盤の囲碁を上手に打つThe small board is not a toy version. It is a complete game with its own strategy, and it is where every technique is easiest to l…
6 minコウのルールと、コウ争いの実際One short rule prevents infinite loops and creates the most tactical situation in go.…
6 mingood shape：なぜ効率のよい形があるのかShape is efficiency. Strong players do not calculate every move — they play formations that are hard to attack and move on.…
6 min囲碁の布石：隅、辺、中央の順The order is not arbitrary. It falls straight out of how many stones each area needs to enclose.…
6 minシチョウとゲタ：逃げる石を捕まえるTwo techniques for catching escaping stones, and the whole-board check that decides which one to use.…
5 min囲碁のヨセ：常に最大の点を打つGames are lost in the endgame more often than anywhere else, usually by playing a five-point move when a twelve-point move was ava…
6 min置き石とコミ：囲碁が公平であり続ける仕組みGo has the best handicap system of any board game, and it turns mismatched games into genuinely competitive ones.…
5 min囲碁の初心者がほぼ必ずやる九つのミスRecognising these early skips months of confusion — most of them come from applying instincts borrowed from other games.…
6 min上海（麻雀ソリティア）
144牌の亀甲積み。必ず全消しできる配牌です。
上海の戦略：どの組を取るかEvery board offers several legal moves and most of them are wrong. The difference between clearing and stalling is which pair you …
6 min取れる牌のルール、詳しくAlmost every mahjong solitaire question turns out to be a question about which tiles are free. Here is the rule with all its edge …
5 min手詰まりを避けるにはA solvable board can still be killed in twenty moves. These are the specific mistakes that do it.…
5 min麻雀牌一式の見分け方Three suits, two honour groups and eight bonus tiles. Knowing what you are looking at makes matching considerably faster.…
5 min上海の盤面をより速く消すSpeed comes from recognising tiles instantly and scanning the board in a fixed order, not from clicking quickly.…
5 min亀甲積みの読み方The classic shape is not arbitrary. Knowing where its pressure points are tells you what to clear and in what order.…
5 min上海は麻雀ではないThey share a tile set and nothing else. Here is what the real game is, and why the confusion exists.…
5 minシャッフルすべき時、戻すべき時You get three shuffles and unlimited undos. Choosing between them well is worth several cleared boards.…
4 min直したい上海の五つのクセEach of these feels efficient in the moment and costs you the board twenty moves later.…
4 min息抜きとしての上海Not every game has to be optimised. Here is how to use the board when the point is the fifteen minutes, not the time on the clock.…
4 min五目並べ
15×15の五目並べ。相手は三・四をきちんと止めてきます。
三と四：五目並べの文法Every gomoku game is a conversation in threats. Learn to name them and the right move usually becomes obvious.…
6 min五目並べの序盤：最初の五手The opening is short but it decides whether you spend the game attacking or defending.…
5 min先手を渡さずに守る五目並べBlocking is necessary, but pure blocking loses. The skill is choosing blocks that also build something.…
5 min連続先手：五目並べはこうして勝つAbove beginner level nobody wins by accident. Wins come from sequences of forcing moves that end in a threat that cannot be answer…
6 min五目並べのコンピューターに勝つThe opponent here blocks threats and searches ahead. Here is what each level actually does and how to play against it.…
5 min負けにつながる六つの五目並べのミスMost losses trace back to one of a handful of habits, and all of them are easy to break once named.…
5 min五目並べ、連珠、そして先手番問題Free-style gomoku is a proven win for Black. The rule variants that exist are all attempts to fix that.…
5 min五目並べの盤面を素早く読むStrong players are not calculating faster. They are scanning the board in a way that makes the important points obvious.…
5 min二人で遊ぶ五目並べTwo-player mode turns the board into a shared one. Here is how to make the games even, and how to teach someone in five minutes.…
4 min五目並べはどこから来たかA game played with go equipment for centuries, formalised in Japan, solved by computer, and still played competitively worldwide.…
5 minチェッカー
強制取り、連続跳び、キング化まで正しく実装。
強制取りのルールとその生かし方Forcing your opponent's hand is the core of checkers tactics. Once you see it, the game changes completely.…
6 minキングと、チェッカー終盤の勝ち方A king is worth roughly two ordinary pieces. Getting the first one usually decides the game.…
6 minチェッカーの序盤：最初の十手You do not need opening books. Four ideas cover the whole opening and they follow from how the pieces move.…
5 min封じ込め：取らずに勝つYou win checkers when your opponent cannot move, not only when they run out of pieces. That second condition is a whole strategy.…
5 min負けを招く六つのチェッカーのミスAlmost all of them come from forgetting that captures are compulsory in both directions.…
5 minチェッカーのコンピューターと対戦するThe opponent here searches ahead with a minimax and never misses a compulsory capture. Here is how to make it a useful training pa…
5 min世界のドラフツのバリエーションEnglish draughts is one of many. The differences in board size and capture rules change the game substantially.…
5 min二人で遊ぶチェッカーTwo-player mode, teaching a beginner, and how to handle a skill gap without either player being bored.…
4 minチェッカーはどこから来たかA five-thousand-year lineage, a nineteenth-century tournament culture, and the game that broke a generation of computer scientists…
5 minチェッカーが強くなるにはThe skill ladder is short and well defined. Here is what to learn, in what order, and how to know when to move on.…
5 min2048
滑らせて、合わせて、大きい数字を隅に置いたまま。
隅の戦略を正しく理解するEveryone says keep the big tile in the corner. Here is why it works and what the rule actually requires you to do.…
6 minスネーク：高得点はこう積み上げるCorner strategy gets you to 2048. The snake gets you to 4096 and beyond, by making every tile part of one long chain.…
6 min2048が早く終わる五つのミスThe board usually dies for one of a small number of reasons, and four of them are entirely within your control.…
5 min2048の先へThe first 2048 tile is a technique problem. The second one, and 4096, are management problems.…
5 min2048のスコアの仕組みYour score is determined entirely by which merges you make, which means it is almost completely predictable from your highest tile…
4 min2048の裏にある数学Powers of two, a fixed spawn probability, and a board that shrinks as you succeed. A short look at why the game is shaped the way …
5 min2048は速さか、正確さかThere is a real trade-off, and it changes as the board fills. Knowing when to switch modes is worth a whole tier of score.…
4 minスマホで2048を遊ぶSwipe accuracy, one-handed play, and the settings that reduce mis-presses on a small screen.…
4 min知っておきたい2048の派生The original spawned hundreds of imitations. A few of them change the game in genuinely interesting ways.…
4 min2048で安定して上達するScores vary a lot game to game, which makes progress hard to see. Here is how to measure it and what to work on.…
4 min