Joe Montana has the highest completion percentage by a quarterback with 20+ completions in a playoff game against the Washington Redskins, at 71.0 percent in the 1990 NFC divisional game on January 12, 1991.

NAME	DATE	ROUND	TM	OPP	PCT	CMP	ATT	YDS	AVG	TD	TD%	INT	INT%	SCK	SCKY	RATE
Joe Montana	1/12/1991	NFC Divisional	SF	vs. WAS	71.0	22	31	274	8.8	2	6.5	1	3.2	2	10	106.1
Steve Young	1/9/1993	NFC Divisional	SF	vs. WAS	66.7	20	30	227	7.6	2	6.7	1	3.3	2	13	97.5
Chris Simms	1/7/2006	NFC Wild Card	TB	vs. WAS	65.8	25	38	198	5.2	0	0.0	2	5.3	3	30	56.7
Erik Kramer	1/12/1992	NFC Championship	DET	@ WAS	63.6	21	33	249	7.5	1	3.0	1	3.0	4	26	84.0
Matt Hasselbeck	1/5/2008	NFC Wild Card	SEA	vs. WAS	62.5	20	32	229	7.2	1	3.1	2	6.3	1	2	68.4
Aaron Rodgers	1/10/2016	NFC Wild Card	GB	@ WAS	58.3	21	36	210	5.8	2	5.6	0	0.0	1	5	93.5
Eric Hipple	1/8/1983	NFC Wild Card	DET	@ WAS	57.9	22	38	298	7.8	1	2.6	2	5.3	4	29	69.8
Joe Montana	1/8/1984	NFC Championship	SF	@ WAS	56.3	27	48	347	7.2	3	6.3	1	2.1	0	0	91.2
Tom Brady	1/9/2021	NFC Wild Card	TB	@ WAS	55.0	22	40	381	9.5	2	5.0	0	0.0	3	16	104.3
Jim Kelly	1/26/1992	Super Bowl	BUF	vs. WAS	48.3	28	58	275	4.7	2	3.4	4	6.9	5	46	44.8
Vince Ferragamo	1/1/1984	NFC Divisional	RAM	@ WAS	46.5	20	43	175	4.1	1	2.3	3	7.0	3	22	36.5
Gus Frerotte	1/8/2000	NFC Wild Card	DET	@ WAS	45.7	21	46	251	5.5	1	2.2	2	4.3	5	38	52.0