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3.51 The challenge must be met if the rating system is to succeed, if it is to produce ratings that will satisfy the players and the users of the rating list.

Rating	K	err	err2	tau	rho	perf	init	median	avg	max	dir	ΔR	\|ΔR\|	ΔR max
EloSRM	648	0.7449	1.1282	0.4186	0.5705	0.2182	2370	2605	2749	4776	54.7	29.3	53.9	1385
SRMFix	247	0.7521	1.1355	0.4126	0.5653	0.2213	1200	1520	1664	3810	48.8	17.6	54.6	1096
SRM		0.8273	1.2219	0.2940	0.3982	0.2970	1200	1198	1315	4107	48.5	-20.9	87.9	1185
constant		0.9887	1.4672	0.0000	0.0000	0.4299	1200	1200	1200	1200	50.0	0.0	0.0	0
initial	120	0.7878	1.1879	0.3948	0.5443	0.1832	1200	1456	1714	4663	48.2	22.1	94.9	1202
K	65	0.7760	1.1702	0.3937	0.5432	0.2251	1200	1369	1581	3962	48.4	14.6	50.4	642
W	184	0.7538	1.1370	0.4117	0.5642	0.2186	1200	1515	1673	3816	48.8	18.8	49.1	1781
M	247	0.7521	1.1355	0.4126	0.5653	0.2213	1200	1520	1664	3810	48.8	17.6	54.6	1096
C	695	0.7489	1.1322	0.4155	0.5681	0.2230	1200	1550	1700	3785	48.9	19.7	55.6	1617
B	674	0.7487	1.1328	0.4159	0.5684	0.2198	1200	1564	1717	3853	49.6	20.9	54.2	1518
G	657	0.7473	1.1306	0.4165	0.5690	0.2171	2042	2257	2406	4445	51.9	24.5	53.2	1491
F	734	0.7458	1.1289	0.4179	0.5701	0.2175	2156	2411	2545	4606	53.7	27.3	54.1	1451
W1	648	0.7449	1.1282	0.4186	0.5705	0.2182	2370	2605	2749	4776	54.7	29.3	53.9	1385