```Help for Powerdrain Introduction Powerdrain is Copyright 2001 by Douglas Zander and is used here with his permission. Welcome to the network Powerdrain server. The rules of Powerdrain are below. The commands are the same for all pbmserv games. Options for Powerdrain Powerdrain move where consists of 4 digits, 2 which are odd digits and 2 which are even digits. The two pairs of digits may be separated by a hyphen (-). The odd digits signify the location on the powergrid (board) and the even digits signify the powerplug (piece) which gets placed into the location. Examples of a move. All these examples are the same move: 24-57 2457 5724 57-24 The move is to place powerplug "24" into location "57". The first digit of the location is from the left side of the board while the second digit of the location is from the top of the board. Powerdrain challenge [-o1|-o2] [-p] The options are -o1 or -o2 for ordering the voltage potentials along the top and left side. -o1 orders the odd digits like this: 1 3 5 7 9 -o2 orders the odd digits like this: 7 9 1 3 5 The option -p will allow the players to pick from a common pool of the 16 powerplugs; the powerplugs are not randomly divided between the players. Rules of Powerdrain Imagine you and your opponent are in a powerstation and your goal is to control the powergrid. One player is positive energy (+) and the other player is negative energy (-). Each player alternately places powerplugs into the sections of the powergrid. After a total of 16 powerplugs are inserted, the powergrid adjusts the voltages of each section of the powergrid and a winner is determined. The winner is the player who has more of his own powerplugs still active. If a tie occurs (both players have an equal number of active powerplugs at the end of the game), then the tie is broken by adding up the power levels of each players' active powerplugs. The player with the greater absolute power level will win the game. There is no further tie breaker. When two powerplugs of opposite polarities touch on their sides, they drain the energy out of each other. A player's powerplug voltage may drain to zero (0) but cannot change into the enemy's polarity. Two powerplugs of the same polarity cannot affect each other (they do not add nor subtract from each other's voltage). An active powerplug is one that is not at zero (0) voltage at the end of the game when all 16 powerplugs have been inserted into the powergrid. A section of the powergrid that does not have a powerplug inserted into it is not affected. The powergrid is given random voltage potential levels along the left side and top of the grid. These random potentials are the 5 odd digits 1,3,5,7,9. The powerplugs are given two random even digits. Each permutation of two even digits is represented by the 16 powerplugs. When a powerplug is inserted into a section of the powergrid, the voltage of the powerplug is determined by adding the absolute values of the differences of the first digit with the left voltage potential and the second digit with the top voltage potential. This is illustrated below: 5 --------- this is an example of two sections of a powergrid 7 | <2 4^ | the powerplug "24" was inserted into the section "75" |+6 +2 | the voltage of this plug is the sums of the absolute --------- differences (2 minus 7) plus (4 minus 5) which is 9 | <8 2^ | 5 + 1 = 6 and since the plug was owned by the positive |-4 0 | player it was given a '+' value. --------- The first number under the plug (+6) represents the value of the plug itself, without any drain from negative plugs that may be on any of its four sides (above, below, on the left and right). The second number below the plug is the voltage of the plug after neighboring enemy plugs are taken into account. Notice that a total of 4 volts was drained off of this plug by negative plugs that were touching this plug. Below is an example of a finished game between player1 and player2. Player1 (positive player) won the game because he had 4 active plugs of his voltage while player2 (negative player) only had 2 active plugs left at the end of the game. Player1 has four (4) active positive plugs left. plug 46 at location 91 with a voltage of +10 plug 26 at location 93 with a voltage of +6 (4 volts were drained) plug 28 at location 71 with a voltage of +8 (4 volts were drained) plug 48 at location 15 with a voltage of +6 Player2 only has two (2) active negative plugs left in the grid. plug 68 at location 31 with a voltage of -10 plug 84 at location 37 with a voltage of -8 1 3 7 5 9 ----------------------------------------- Positive + player1 9 | <4 6^ | <2 6^ | <4 2^ | <8 2^ | <2 2^ | |+10 +10|+10 +6 |+10 0 |-4 0 |+14 0 | ----------------------------------------- 7 | <2 8^ | <6 6^ | <4 4^ | | <2 4^ | Negative - player2 |+12 +8 |-4 0 |-6 0 | |-10 0 | ----------------------------------------- 1 | <8 8^ | <8 6^ | <6 2^ | <4 8^ | | |+14 0 |-10 0 |+10 0 |+6 +6 | | ----------------------------------------- 5 | <6 4^ | | | | | |-4 0 | | | | | ----------------------------------------- 3 | <6 8^ | | <8 4^ | | | |-10 -10| |-8 -8 | | | ----------------------------------------- ```