Appendix  --  Performance on Test Suites as of July 31, 1997

Test Configuration

• DARKTHOUGHT as of July 31, 1997 with 4M transposition-table entries (2M per side), 512K King hash-table entries (256K per side), and 256K Pawn hash-table entries,

• Digital Unix 4.0b program development tools and operating system,

• 500MHz AlphaPC164 workstation (500MHz DEC Alpha-21164a EV56 CPU, 8KB/8KB on-chip I/D L1 caches, 96KB unified on-chip L2 cache, 1MB unified off-chip L3 cache, DEC PC164 mainboard, 8x16MB PS/2 SIMMs = 128MB RAM) as provided by Digital Equipment Corp. under external technology research contract DE-0032-97 entitled ``Optimization and Fine-Tuning of a Sophisticated Tree-Searching Application for 64-bit Alpha CPUs''.

Test Suite Results

Test Suite	Time	Result	Speed
BS-2830   ( DARKTHOUGHT rating = 2638)	15 min.	14 / 27	225K nps
BT-2630   ( DARKTHOUGHT rating = 2494)	15 min.	27 / 30	264K nps
LCT-II     ( DARKTHOUGHT rating = 2535)	10 min.	26 / 35	249K nps
Bratko / Kopec	1 min.	18 / 24	214K nps
Encyclopedia of Chess Middlegames	20 sec.	609 / 879	249K nps
Win at Chess	5 sec.	287 / 300	267K nps
World's Greatest Chess Games	10 sec.	22 / 50	224K nps
1001 Brilliant Ways to Checkmate	5 sec.	946 / 1001	313K nps
1001 Winning Chess Sacrifices	5 sec.	830 / 1001	259K nps
Nolot Positions   (#1 Nxh6! 20:40 min. -	60 min.	3 / 11	210K nps
#10 Rxf7! 44:25 min. - #11 Rxh6! 2:40 min.)

Solution Times for BS-2830

#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	(in sec.)
516	17	-	18	-	282	13	-	24	298	#00
-	342	31	-	-	-	-	-	-	-	#10
405	245	204	11	-	-	41				#20

Solution Times for BT-2630

#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	(in sec.)
0	2	6	48	0	0	0	1	-	6	#00
1	14	572	2	8	-	9	0	24	2	#10
122	2	179	7	12	-	4	119	208	48	#20

Solution Times for LCT-II

#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	(in sec.)
15	0	-	-	66	42	264	-	5	-	#00
52	164	525	0	2	0	1	110	3	12	#10
11	15	-	15	-	-	0	0	3	30	#20
5	2	25	-	-						#30

Measured Peak Speed = 665K nps
(in position ``6R1/8/3K4/8/8/7p/7k/8 w - - 0 1'' from ECE3 with timing = 5 sec).