Tetris: One stick clearing four lines. The game.

Downstacking: Clearing the lines your opponents add to you while adding lines to them in return.
    Good downstacking: Clearing lines returning high yield.
    Bad downstacking: Clearing lines returning poor yield.

Yield: Number of cleared lines through number of added lines by a player. 0% <= ¥ <= 100 %. This is an indication of your offensive strength.

apm: Number of lines added per minute. This is an absolute measurement of your offensive strength.

ppm: Number of pieces dropped per minute. (In other words, your speed.) There has been a certain amount of confusion regarding this term since in Quadra, ppm mean points per minute while bpm stands for blocks per minute.

Upfield: The part of the field consisting of the lines the other player(s) have added to you.
    Shattered Upfield: Upfield where good downstacking is hard to achieve (i. e., the holes in the field are at different horizontal positions).
    Solid Upfield: Upfield where good downstacking comes easy (i. e., the holes in the field are aligned at the same horizontal positions, making up slides in the field for sticks and L's).
    Destroyed Upfield: Upfield with more than one hole on each horizontal row, caused by the Addline special or server suddendeath adds.

Meltdown: The procedure where a skilled Tetris player can take down an entire field with only a minimal amount of blocks, doing great amounts of damage to the other players.

Cleansweep: A player removing all blocks from the board (without the help of specials). Also known as Clean Canvas.

Recursive Tetris: Tetris game utilizing gravity effect. This means that if you cut off a chunk of blocks from the main field, that chunk will fall down and possibly clear additional lines. Quadra and The Next Tetris are recursive Tetris games.

Gravity Tetris: This can mean two things. In TetriNET it means using a Block Gravity special to create a deep slide which is then used to make the tetris. In recursive Tetris the term is used to describe how several sticks (or other blocks) are stacked vertically on a bridge over a slide, after which the bridge is cleared and the blocks fall down producing a "Monster Add".
 

Monster Add: See above.

Tetrix: GNU TetriNET Server written by drslum, mostly run on UNIX machines.

Tserv: Simple Windows one-channel TetriNET server written by ekn with a few basic control commands and features, now obsolete.

T game: Pure Tetris game where all Tetris pieces are replaced by T blocks, earlier used in TetriNET ladder matches to eliminate cheating and also by HellFire members to train principles of stacking. 

Classic Rules: This is when the lines cleared by you add to the opponent. All serious TetriNET players play by classic rules, however, it wasn't introduced in TetriNET until version 1.1. Some people use this term to describe pure TetriNET which is incorrect. 

Block Names:
 

Box		Sharp Horizontal T
Blunt Stick		Sharp Vertical T
Sharp Stick		Blunt Horizontal L
Blunt Z		Blunt Vertical L
Sharp Z		Sharp Horizontal L
Blunt T		Sharp Vertical L

A little something about Tetris pieces: For anyone thinking of Tetris as a simple, predictable game, consider this.

The Stick: It can be placed horizontal or vertical. Assuming a standard 12x grid, the possibilities are twelve vertical plus eight horizontal positions, totalling twenty.

The Right or Left Z: It can also be placed horizontal or vertical. The possibilities are eleven vertical plus nine horizontal positions, totalling twenty.

The T: It can be placed in two vertical and two horizontal ways. The possibilites are eleven for each vertical plus nine for each horizontal rotation, totalling forty.

The Right or Left L: It can also be placed in two vertical and two horizontal rotations. The possibilities here likewise totals forty.

The Box: It can not be rotated. It can be placed in eleven ways.

This gives us twenty plus two times twenty plus forty plus two times forty plus eleven placings, totalling one hundred ninety and one ways to place the first block.

Without using slides, the first three blocks of a Tetris game can be placed in six million ninehundred sixty seven thousand eight hundred and seventy one different ways on a standard board.

The number of possible ways to play a 100 pieces Tetris game is far greater than the estimated number of atoms in the Universe.

spindizzy/HELLFIRE, 10/00

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