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Active7 years, 7 months ago
Currently I'm working on an Othello/Reversi game in c++. I have it 'finished' except that the Minimax algorithm I'm using for the Computer player is painfully slow when I set it at a depth that produces a semi-challenging AI.
The basic setup of my game is that the board is represented by a 2-dimensional array, with each cell on the board assigned a value in the array (
xMarker , oMarker , or underscore ).
Here's the minimax algorithm so far:
The function
checkForFlips() returns the number of flips that would result from playing at the given cell. MAX_DEPTH is set to 6 at the moment, and it's quite slow (maybe about 10-15 seconds per play)
The only idea I've come up with so far would be to store the tree each time, and then pick up from where I left off, but I'm not sure how to go about implementing that or if it would be too effective. Any ideas or suggestions would be appreciated!
williamgwilliamg
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4 Answers
Calculating minimax is slow.The first possible optimization is alpha-beta pruning:http://en.wikipedia.org/wiki/Alpha-beta_pruning
ShirokoShiroko
You shouldn't duplicate board, that's very inefficient. Make the move before you call yourself recursively, but save enough information to undo the same move after you return from the recursive call. That way you only need one board.
But Shiroko is right, alpha-beta pruning is the first step.
jahhajjahhaj
@Shiroko's suggestion is great, but there are more optimization opportunities.
You pass the state of the
Board by value, and then copy it inside the loop. I'd pass the Board as a pointer or as const Board& b . If this is still expensive, you could use a poinger to a single board, and reverse every move after you evaluate it. In any case don't allocate it on the heap.
You can also run this algorithm on multiple cores. You will need to write a variation of the for loop at the first level using openmp (or equivalent).
user180326
Program Tv Minimax Azi
The most obvious way to improve it would be through alpha-beta pruning or negascout. 3d object converter 4.80 full torrent.
However, if you want to stick with minimax, you can't make it go too fast, as it is a brute force algorithm. One way to improve it would be to change it to Negamax, which would get rid of some of the logic required in this code. Another way would be to use a one dimensional array for the board instead of Board. To make calculations easier, use a length of 100, so the positions are in row-column form(e.g. index 27 is row 2, column 7).
But if you want it to go faster, try pruning.
jcolen19jcolen19
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(Redirected from Minimax tv)
Minimax is a European pay television channel aimed at children, broadcasting to Central European countries including Hungary, the Czech Republic, Slovakia, ex-Yugoslav countries, Romania and Moldova. Minimax's policy goals include edutainment and non-violent programs.
As of 2018, the channel runs 24 hours a day. Previously, since 2000, Minimax timeshared with Musicmax, Game One, ITV Hungary, M+, Cool, Animax and C8 over the years.
As the channel broadcasts in multiple countries in multiple languages with the same schedule (except commercial advertisements), program trailers and other presentation elements do not feature written information.
History[edit]
Minimax was launched in Hungary on 6 December 1999. At launch, the channel aired only between 18:00-20:00 CET.[1] Until 15 May 2000, it gradually extended its broadcast hours, and from that date onwards, the channel aired between 06:00-20:00 CET until 31 December 2017.
Program Tv Minimax
In April 2000, a regional version of the French television channel Game One (originally planned as Game Channel) began timesharing with Minimax, broadcasting between 20:00-06:00 CET. In 1 June 2001, Minimax launched in Romania. On 27 August 2001, ITV Hungary took over Game One's time space.
In 2003, ITV Hungary closed down and Minimax launched in Slovakia. Free cr2 to jpg converter. On 15 September 2004, Minimax launched in Czech Republic, taking over the channel space of the defunct TV channel Supermax. On 15 September 2003, M+ took over the evening slot. Newbluefx bundle 3 0 keygen music.
On 4 September 2004, M+ merged with Humor 1 and renamed as Cool. When it was still called M+, it has operated independently from Minimax beginning in 6 December 2003. On 4 December 2004, A+ Anime began timesharing with Minimax, replacing Cool. On 6 September 2006, Sony Pictures Television International acquired A+ and later relaunched it as Animax on 2 July 2007.[2]
In 2007, Chellomedia (now AMC Networks International) acquired Minimax from the original owner. Later that year, the channel launched in Serbia, Montenegro, Bosnia-Herzegovina and North Macedonia.
Animax broadcast for the last time in the region on 31 March 2014, and was relaunched as C8 on 1 April 2014 in Hungary and 5 May 2014 in Romania, the Czech Republic, and Slovakia.[3] On 30 December 2015, C8 closed down in the Czech Republic, Slovakia, Serbia, and Romania. Since that time, Minimax is 24/7 in those countries.[4]
On 1 January 2016, Minimax began operating 24/7 continuously except in Hungary, where it still timeshared with C8. On 5 October 2017, AMC announced that Minimax becomes 24/7 in Hungary. In December 2017, it was announced that Minimax would operate for 24 hours per day in Serbia by New Year's Eve.[5] On 1 January 2018, when C8 completely closed down, Minimax filled up the overnight slot, thereby running 24/7 onwards in Hungary too.
Programming[edit]Announcers[edit]
See Also[edit]References[edit]
Program Tv Minimax DuminicaExternal links[edit]Program Tv Cartoon Network
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