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Basic Attack Chance (BAtCh Matrix)

Table: General Combat Matrix (BAtCh)
		Attacker's BAtCh
	Def. AC	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1
	10	10	9	8	7	6	5	4	3	2	1
	9	11	10	9	8	7	6	5	4	3	2	1
	8	12	11	10	9	8	7	6	5	4	3	2	1
	7	13	12	11	10	9	8	7	6	5	4	3	2	1
	6	14	13	12	11	10	9	8	7	6	5	4	3	2	1
	5	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1
	4	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1
	3	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1
	2	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1
	1	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1
	0	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1
	-1	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2
	-2	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3
	-3	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4
	-4	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5
	-5	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6
	-6	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7
	-7	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8
	-8	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9
	-9	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10
	-10	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11

To use this table, the attacker will roll a D20 and then match his BAtCh against the defender's armor class (AC). For example, if an attacker has a BAtCh of 17 and rolls a 14 on his/her D20 attack roll, that attack will hit AC(3) or weaker. This table also is used for parrying. For instance, a defender with BAtCh(19) wearing AC(7) armor is hit with a blow that land against AC(3), the defender would need to roll a 16 or higher to parry the blow.

It should also be noted that an unmodified D20=20 always hits/parries because it is a critical success while an unmodified D20=1 always misses (or fails to defend) because a critical fumble al;ways indicates failure.