Untitled Document

The ICCF Rating system is a numerical system in which percentage scores are converted to rating differences and conversely, rating differences are convertible to scoring probabilities.
The basis of the system is the normal probability function of statistical probability theory.

The detailed conversion tables and working formulae can be found in the minutes from the 2000 ICCF Congress.

A	B	C	D	E	Title	I	II	III	IV	V	VI	VII	VIII	IX	X	XI	XII	XIII	XIV	XV	XVI	XVII	XVIII
9	8	3	7	6	GM							6½	6	6	5½	5½	5	5	4½	4	4	3½	3½
					SIM			6½	6	6	5½	5½	5	5	4½	4	4	3½	3½	3	3	2½	2½
					IM	6½	6	6	5½	5½	5	5	4½	4	4	3½	3½	3	3	2½	2½	2	2
10	9	4	8	6	GM							7	7	6½	6	6	5½	5½	5	4½	4½	4	4
					SIM			7	7	6½	6	6	5½	5½	5	4½	4½	4	4	3½	3	3	2½
					IM	7	7	6½	6	6	5½	5½	5	4½	4½	4	4	3½	3	3	2½	2½	2
11	10	4	9	7	GM							8	7½	7	7	6½	6	6	5½	5	5	4½	4
					SIM			8	7½	7	7	6½	6	6	5½	5	5	4½	4	4	3½	3	3
					IM	8	7½	7	7	6½	6	6	5½	5	5	4½	4	4	3½	3	3	2½	2½
12	11	4	9	8	GM							8½	8	8	7½	7	7	6½	6	5½	5½	5	4½
					SIM			8½	8	8	7½	7	7	6½	6	5½	5½	5	4½	4	4	3½	3
					IM	8½	8	8	7½	7	7	6½	6	5½	5½	5	4½	4	4	3½	3	3	2½
13	12	5	10	8	GM							9½	9	8½	8	8	7½	7	6½	6	6	5½	5
					SIM			9½	9	8½	8	8	7½	7	6½	6	6	5½	5	4½	4	4	3½
					IM	9½	9	8½	8	8	7½	7	6½	6	6	5½	5	4½	4	4	3½	3	3
14	13	5	11	9	GM							10	9½	9½	9	8½	8	7½	7	6½	6½	6	5½
					SIM			10	9½	9½	9	8½	8	7½	7	6½	6½	6	5½	5	4½	4	3½
					IM	10	9½	9½	9	8½	8	7½	7	6½	6½	6	5½	5	4½	4	3½	3½	3
15	14	5	12	9	GM							11	10½	10	9½	9	8½	8	7½	7	7	6	6
					SIM			11	10½	10	9½	9	8½	8	7½	7	7	6	6	5	5	4½	4
					IM	11	10½	10	9½	9	8½	8	7½	7	7	6	6	5	5	4½	4	3½	3½
16	15	6	12	10	GM							11½	11	10½	10	10	9	8½	8	7½	7	6½	6
					SIM			11½	11	10½	10	10	9	8½	8	7½	7	6½	6	5½	5	4½	4½
					IM	11½	11	10½	10	10	9	8½	8	7½	7	6½	6	5½	5	4½	4½	4	3½
17	16	6	13	11	GM							12½	12	11½	11	10½	10	9½	8½	8	7½	7	6½
					SIM			12½	12	11½	11	10½	10	9½	8½	8	7½	7	6½	6	5½	5	4½
					IM	12½	12	11½	11	10½	10	9½	8½	8	7½	7	6½	6	5½	5	4½	4	3½
18	17	6	14	11	GM							13	12½	12	11½	11	10½	10	9	8½	8	7½	7
					SIM			13	12½	12	11½	11	10½	10	9	8½	8	7½	7	6½	6	5½	5
					IM	13	12½	12	11½	11	10½	10	9	8½	8	7½	7	6½	6	5½	5	4½	4
19	18	7	15	12	GM							14	13½	13	12½	11½	11	10½	9½	9	8½	8	7½
					SIM			14	13½	13	12½	11½	11	10½	9½	9	8½	8	7½	6½	6	5½	5
					IM	14	13½	13	12½	11½	11	10½	9½	9	8½	8	7½	6½	6	5½	5	4½	4
20	19	7	15	12	GM							14½	14	13½	13	12½	11½	11	10½	9½	9	8½	8
					SIM			14½	14	13½	13	12½	11½	11	10½	9½	9	8½	8	7	6½	6	5½
					IM	14½	14	13½	13	12½	11½	11	10½	9½	9	8½	8	7	6½	6	5½	5	4½

The above table shows the various norms required for different titles in tournaments of various size and strength, where;

A = The number of participants,
B = The number of games,
C = The minimum number of players not belonging to one and the same federation,
D = The minimum number of rated players,
E = The minimum number of players with a fixed rating,
Title = Title requirements in a tournament of size A for GM (LGM), SIM, IM (LIM) respectively, for categories I - XVIII,
I - XVIII = Required title norms in a tournament of size A in the specific category, where the categories are determined as follows

Category
Average rating

For ladies

I

2251 - 2275

1951 - 1975

II

2276 - 2300

1976 - 2000

III

2301 - 2325

2001 - 2025

IV

2326 - 2350

2026 - 2050

V

2351 - 2375

2051 - 2075

VI

2376 - 2400

2076 - 2100

VII

2401 - 2425

2101 - 2125

VIII

2426 - 2450

2126 - 2150

IX

2451 - 2475

2151 - 2175

X

2476 - 2500

2176 - 2200

XI

2501 - 2525

2201 - 2225

XII

2526 - 2550

2226 - 2250

XIII

2551 - 2575

2251 - 2275

XIV

2576 - 2600

2276 - 2300

XV

2601 - 2625

2301 - 2325

XVI

2626 - 2650

2326 - 2350

XVII

2651 - 2675

2351 - 2375

XVIII

2676 - 2700

2376 - 2400

By Ragnar Wikman, Deputy President - Rules