Play65'in tavla oynamak isteyenlere ücretsiz olarak sunduğu internet tavla yazılımı konusunda liderdir. 3D grafikleri, gerçek düzeyde ki ses kalitesi ve en önemli iki özelliği güvenliği ve chat özelliğidir. Play65 çok komplike bir yazılımdır. Zarların her atışta normal hayattaki gibi rastlantısal halde olabilmesi için özel olarak C dilinde bir program geliştirilmiştir. Bu programın ayrıntıları alttadır.

/*************************************************************************/ /* A C-program for MT19937: Integer version (1999/10/28) */ /* gen rand() generates one pseudo random unsigned integer (32-bit) */ /* which is uniformly distributed among 0 to 2^32-1 for each */ /* call. sgen rand(seed) sets initial values to the working area */ /* of 624 words. Before gen rand(), sgen rand(seed) must be */ /* called once. (Seed is any 32-bit integer.) */ /* Coded by Takuji Nishimura, considering the suggestions by */ /* Topher Cooper and Marc Rieffel in July-Aug. 1997. */ /*************************************************************************/ /* Adapted for use in Rational VuC by Roland Stens after a */ /* suggestion by Calvin Arnason. Feedback on this implementation */ /* can be sent to rstens@uniserve.com */ /*************************************************************************/ /* This library is free software; you can redistribute it and/or */ /* modify it under the terms of the GNU Library General Public */ /* License as published by the Free Software Foundation; either */ /* version 2 of the license, or (at your option) any later */ /* version. This library is distributed in the hope that it will */ /* be useful, but WITHOUT ANY WARRANTY; without even the implied */ /* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. */ /* See the GNU Library General Public License for more details. */ /* You should have received a copy of the GNU Library General */ /* Public License along with this library; if not, write to the */ /* Free Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA */ /* 02111-1307 USA */ /*************************************************************************/ /* Copyright (C) 1997, 1999 Makoto Matsumoto and Takuji Nishimura. */ /* Any feedback is very welcome. For any question, comments, */ /* see http://www.math.keio.ac.jp/matumoto/emt.html or email */ /* matumoto@math.keio.ac.jp */ /*************************************************************************/ /* REFERENCE */ /* M. Matsumoto and T. Nishimura, */ /* "Mersenne Twister: A 623-Dimensionally Equidistributed Uniform */ /* Pseudo- random Number Generator", ACM Transactions on Modeling */ /* and Computer Simulation, Vol. 8, No. 1, January 1998, pp 3--3. */ /*************************************************************************/ #include <VU.h> /* Period parameters */ #define N 624 #define M 397 #define MATRIX_A 0x9908b0df /* constant vector a */ #define UPPER_MASK 0x80000000 /* most significant w-r bits */ #define LOWER_MASK 0x7fffffff /* least significant r bits */ /* Tempering parameters */ #define TEMPERING_MASK_B 0x9d2c5680 #define TEMPERING_MASK_C 0xefc60000 #define TEMPERING_SHIFT_U(y) (y >> 11) #define TEMPERING_SHIFT_S(y) (y << 7) #define TEMPERING_SHIFT_T(y) (y << 15) #define TEMPERING_SHIFT_L(y) (y >> 18) int mt\[N\]; /* the array for the state vector */ int mti; /* mti==N+1 means mt\[N\] is not initialized */ /* Initializing the array with a seed */ proc sgen rand(seed) int seed; { int i; for (i=0;i<N;i++) { mt\[i\] = seed & 0xffff0000; seed = 69069 * seed + 1; mt\[i\] |= (seed & 0xffff0000) >> 16; seed = 69069 * seed + 1; } mti = N; } /***************************************************************************/ /* Initialization by "sgen rand()" is an example. Theoretically, */ /* there are 2^19937-1 possible states as an initial state. */ /* This function allows to choose any of 2^19937-1 ones. */ /* Essential bits in "seed_array\[\]" are the following 19937 bits: */ /* (seed_array\[0\]&UPPER_MASK), seed_array\[1\], ..., seed_array\[N-1\]. */ /* (seed_array\[0\]&LOWER_MASK) is discarded. Theoretically, */ /* (seed_array\[0\]&UPPER_MASK), seed_array\[1\], ..., seed_array\[N-1\] */ /* can take any values except all zeros. */ /***************************************************************************/ int func gen rand() { int y; int mag01\[2\]={0x0, MATRIX_A}; /* mag01\[x\] = x * MATRIX_A for x=0,1 */ if (mti >= N) { /* generate N words at one time */ int kk; if (mti == N+1) /* if sgen rand() has not been called, */ sgen rand(4357); /* a default initial seed is used */ for (kk=0;kk<N-M;kk++) { y = (mt\[kk\]&UPPER_MASK)|(mt\[kk+1\]&LOWER_MASK); mt\[kk\] = mt\[kk+M\] ^ (y >> 1) ^ mag01\[y & 0x1\]; } for (;kk<N-1;kk++) { y = (mt\[kk\]&UPPER_MASK)| (mt\[kk+1\]&LOWER_MASK); mt\[kk\] = mt\[kk+(M-N)\] ^ (y >> 1) ^ mag01\[y & 0x1\]; } y = (mt\[N-1\]&UPPER_MASK)|(mt\[0\]&LOWER_MASK); mt\[N-1\] = mt\[M-1\] ^ (y >> 1) ^ mag01\[y & 0x1\]; mti = 0; } y = mt\[mti++\]; y ^= TEMPERING_SHIFT_U(y); y ^= TEMPERING_SHIFT_S(y) & TEMPERING_MASK_B; y ^= TEMPERING_SHIFT_T(y) & TEMPERING_MASK_C; y ^= TEMPERING_SHIFT_L(y); return y; } /*************************************************************************/ /* "Mersenne Twister" VuC random functions added by Roland Stens */ /*************************************************************************/ /* Replacement for the "uniform" function */ int func mtuniform(start,end) int start; int end; { return abs(gen rand() % (end-start+1)) + start; } /* Replacement for the " rand" function */ int func mt rand() { return abs(gen rand() % 32768); } /* The seed function */ proc smt rand(seed) int seed; { sgen rand(seed); } /*************************************************************************/ /*************************************************************************/

C konusunda bilgi sahibi olan kullanıcılar üstteki C kodlarını inceleyerek ranstlantısal algoritmanın ne kadar olağan çalıştığını anlayabilirler.

Play65 hiç bir zaman iki oyuncu arasında direk bağlantı kurmaz. Tüm veriler Play65 sunucusu aracılığı ile ortak oyun oynayan oyunculara iletilir. Bu bilgi alış-verişi de 256 bit SSL güvenli bağlantı ile korunur. Yani tüm veriler 2 üzeri 256 kadar kombinasyon ile şifrelenir.