Update

chess.md

@@ -29,7 +29,7 @@ Chess as a game is not and cannot be [copyrighted](copyright.md), but **can ches
 
 ## Chess In General
 
-Chess evolved from ancient board games in India (most notably Chaturanga) in about 6th century -- some sources say that in chess predecessor games dice was used to determine which man a player was allowed to move but that once dice were banned because of hazard games, we got the variant without any element of chance. Nowadays the game is internationally governed by **FIDE** which has taken the on role of an authority that defines the official rules: FIDE rules are considered to be the standard chess rules. FIDE also organizes tournaments, promotes the game and keeps a list of registered players whose performance it rates with so called Elo system --⁠ based on the performance it also grants titles such as **Grandmaster** (GM, strongest), **Internation Master** (IM, second strongest) or **Candidate Master** (CM). A game of chess is so interesting in itself that chess is usually not played for money like many other games ([poker](poker.md), [backgammon](backgammon.md), ...).
+Chess evolved from ancient board games in India (most notably Chaturanga) in about 6th century -- some sources say that in chess predecessor games dice was used to determine which man a player was allowed to move but that once dice were banned because of hazard games, we got the variant without any element of chance. Nowadays the game is internationally governed by **FIDE** which has taken the on role of an authority that defines the official rules: FIDE rules are considered to be the standard chess rules. FIDE also organizes tournaments, promotes the game and keeps a list of registered players whose performance it rates with so called **[Elo](elo.md)** system --⁠ based on the performance it also grants titles such as **Grandmaster** (GM, strongest), **Internation Master** (IM, second strongest) or **Candidate Master** (CM). A game of chess is so interesting in itself that chess is usually not played for money like many other games ([poker](poker.md), [backgammon](backgammon.md), ...).
 
 The mastery of chess is often divided into two main areas (it is also common to divide strong players into these two categories depending on where their main strength lies):
 
@@ -42,7 +42,7 @@ A single game of chess is seen as consisting of three stages: **opening** (start
 
 The study of chess openings is called **opening theory** or just *theory*. Playing the opening stage is special by being based on memorization of this theory, i.e. hundreds or even thousands of existing opening lines that have been studied and analyzed by computers, rather than by performing mental calculation (logical "thinking ahead" present in middlegame and endgame). Some see this as weakness of chess that makes players spend extreme energy on pure memorization. One of the best and most famous players, Bobby Fischer, was of this opinion and has created a chess variant with randomized starting position that prevents such memorization, so called *chess 960*.
 
-**[Elo](elo.md) rating** is a mathematical system of numerically rating the performance of players (it is used in many sports, not just chess). Given two players with Elo rating it is possible to compute the probability of the game's outcome (e.g. white has 70% chance of winning etc.). The FIDE set the parameters so that the rating is roughly this: < 1000: beginner, 1000-2000: intermediate, 2000-3000: master. More advanced systems have also been created, namely the Glicko system.
+**[Elo](elo.md) rating** is a mathematical system of numerically rating the performance of players (it is used in many sports, not just chess); Elo basically assigns players a rating number that says how skilled the player is. Given two players with Elo rating it is possible to compute the probability of the game's outcome (e.g. white has 70% chance of winning etc.). The FIDE set the parameters so that the rating is roughly this: < 1000: beginner, 1000-2000: intermediate, 2000-3000: master (currently best humans rate close to 3000). More advanced systems have also been created, namely the Glicko system, however these are often quite [bloated](bloat.md) and complicated, so Elo stays the most commonly used rating system. Other ways of determining player skills also exist, for example so called accuracy, which says how closely one played to the perfect play according to some strong engine such as Stockfish. The advantage here is that to rate a player we don't need too much data like with Elo (which needs to see many games of the player against other already rated players) -- it may be enough to let the player play a few games against a computer to determine his skill. A disadvantage however lies in how exactly to compute the accuracy because it's a bit complicated by other factors, for example in many situations finding the best move is trivial (like retaking a queen in queen exchange) while in others it's much more difficult, or the fact that humans often DON'T want to play the mathematically best move but rather a bit weaker but more comfortable one, so even grandmasters often choose a weaker move even though they know the theoretically best move.
 
 The rules of chess are quite simple ([easy to learn, hard to master](easy_to_learn_hard_to_master.md)) and can be found anywhere on the Internet. In short, the game is played on a 8x8 board by two players: one with **[white](white.md)** men, one with **[black](black.md)** (LOL IT'S [RACIST](racism.md) :D). Each man has a way of moving and capturing (eliminating) enemy men, for example bishops move diagonally while pawns move one square forward and take diagonally. The goal is to **checkmate** the opponent's king, i.e. make the king attacked by a man while giving him no way to escape this attack. There are also lesser known rules that noobs often miss and ignore, e.g. so called en-passant or the 50 move rule that declares a draw if there has been no significant move for 50 moves.