Blitz chess

Blitz chess is high-speed chess that allots only 5 minutes or so per side. The world championship in blitz chess allows only 3 minutes per side but 2 extra seconds per move. Blitz chess is faster than "rapid chess," which allows 10 minutes per side.

It is common for a player to win blitz chess when his opponent runs out of time (flagging). This happened to world champion Magnus Carlsen at the Sinquefield Cup in 2019 where blitz chess is used as a playoff if classical chess and rapid chess fail to produce a clear winner.

Blitz chess rewards quickness, and players who excel at blitz chess are not necessarily the same who prevail at the slower, classical chess. However, mastering classical chess is considered essential prior to excelling at blitz chess.

Overall strategy

Quick, conservative moves during the opening phase, while attempting to build an advantage in time or position, is a winning approach. Vigilance for blunders by the other side to gain an advantage in pieces, while carefully avoiding blunders of one's own, can help win in a majority of these games.

Placing the opponents queen in jeopardy with protected pieces, and likewise for the opponent's king (without the need for protecting the attacking piece), can help attain a time and positional advantage.

Common mistakes

Here are some common mistakes made in blitz chess:

• overreacting to one's own blunder which causes a lost piece - top players can win starting without even a queen.
• failing to recognize the imminent possibility of checkmate by either side.
• failing to recognize hidden attacks.
• advancing the queen too early in the game.
• failing to notice what the most recent move by the opponent was.

Strategy based on time or relative position

At any point beyond the initial opening, you will be either ahead or behind on the clock, or ahead or behind in pieces. Each of those situations entails different strategy.

Ahead on time

When ahead on time in blitz chess, the strategy should become more defensive as the other side is required by the clock to take more chances. Protect your king and queen, and look for mistakes by the other side.

The emphasis if ahead on time should be to use the extra time to avoid blunders, which often decide the outcome in blitz chess.

If the other side plays defensively then you'll win on the clock; if the other side aggressive attacks your defenses, then you can capture their pieces and gain an additional advantage.

Don't be afraid to exchange major or minor pieces when ahead on time. Better to exchange them in an even trade than have the other side capture them with aggressive play to catch up.

Ahead on pieces

When ahead with major (queen or rook) or minor (knight or bishop) pieces, then in blitz chess it is advantageous to immediately force trades in other pieces with the other side. Their arsenal diminishes as does yours, but it becomes impossible for the other side to prevail.

Pawns are not considered "pieces" but if you have an edge of several pawns over the opponent, then a trading strategy should also be considered.

The bigger the advantage on pieces (such as capturing the other side's queen), the more aggressive the trading strategy should be.

Ahead on position

When ahead on position, then focus on attaining checkmate without being distracted by the opponent's clock. Managing enough time to checkmate the opponent becomes the priority. Your opponent is unlikely to recognize your positional advantage and may feel overconfident if it has an advantage on time or in pieces.

Time Management

Managing the time effectively is perhaps the most important tactical consideration. Sizing up the board while the opponent thinks of his moves, and quickly assessing the threats that his pieces and movements present, is essential.

When a player is behind on the clock with less than 2 minutes to go, the best strategy is not to try to catch up on time, but to manage what time is left in order to achieve checkmate. Moving quickly when ahead on the board but behind on the clock is a mistake in blitz chess. Instead, ignore your opponent's clock and instead manage the time in pursuit of checkmate.

Spending less time on early moves and more time when one's king or queen is in jeopardy is helpful. When ahead on the clock, taking a bit more time to be careful is worthwhile. When behind on the clock, look for opportunities for capturing pieces which result from mistakes by the opponent as he moves too quickly.

Successful tactics

Placing your opponent in check quickly is an often successful approach to blitz chess. But if ahead on pieces near the end of the game, repeatedly putting the opponent in check can simply waste valuable time which could instead be used to develop a path to victory by checkmate.

Algorithm

Quick algorithms are helpful to manage time. When the other side moves, quickly review:

• does their move jeopardize, directly or indirectly, one's king or queen
• did they blunder in their move such that their piece can be captured
• can you move a piece out of jeopardy by placing the other side in check, or jeopardizing one of their pieces?

Probabilities

In blitz chess, it is helpful to consider probabilities or riskiness of certain positions, such as the risk of advancing one's queen early in a game. More time will be required to guard against loss of that queen, which could end up causing a lost game even when the queen is not captured.