most unearned runs allowed in 1 season for pirates

The Pittsburgh Alleghenys allowed their most runs in a season in 1890, with 1,235 runs.

	TEAM	R	SEASON	G	W%	W	L	GS	ERA	SO	CG	SHO	SV	IP	H	ER	HR	BB	HBP	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Alleghenys	1,235	1890	138	.169	23	113	138	5.97	381	119		0	1176.1	1,520	780	52	573	79		5,664	115	2.91	4.38	0.66	0.40	6.7	10.1	1.78	.321	9.45	11.63
2	Pirates	981	1894	133	.500	65	65	133	5.62	308	106		0	1170.2	1,563	731	39	466	39		5,439	21	2.37	3.58	0.66	0.30	5.7	8.6	1.73	.332	7.54	12.02
3	Pirates	928	1930	154	.519	80	74	154	5.24	393	80	7	13	1361.1	1,730	793	128	438	29		6,167	25	2.60	2.90	0.90	0.85	6.4	7.1	1.59	.309	6.14	11.44
4	Pirates	911	2019	162	.426	69	93	162	5.18	1,443	1	0	31	1440.0	1,511	829	241	584	85	22	6,391	50	9.02	3.65	2.47	1.51	22.6	9.1	1.45	.315	5.69	9.44
5	Pirates	888	2000	162	.426	69	93	162	4.94	1,070	5	2	27	1449.0	1,554	795	163	711	60	61	6,514	67	6.65	4.42	1.50	1.01	16.4	10.9	1.56	.308	5.52	9.65
6	Pirates	887	1953	154	.325	50	104	154	5.22	607	49	4	10	1358.0	1,529	788	168	577	21		6,059	44	4.02	3.82	1.05	1.11	10.0	9.5	1.55	.290	5.88	10.13
7	Pirates	884	2008	162	.414	67	95	162	5.08	963	3	2	34	1455.0	1,631	822	176	657	49	31	6,528	64	5.96	4.06	1.47	1.09	14.8	10.1	1.57	.311	5.47	10.09
8	Pirates	866	2010	162	.352	57	105	162	5.00	1,026	1	1	31	1411.2	1,567	784	167	538	66	40	6,300	56	6.54	3.43	1.91	1.06	16.3	8.5	1.49	.311	5.52	9.99
9	Pirates	858	2001	162	.383	62	100	162	5.05	908	8	2	36	1416.1	1,493	794	167	549	80	74	6,222	49	5.77	3.49	1.65	1.06	14.6	8.8	1.44	.293	5.45	9.49
10	Pirates	857	1950	154	.373	57	96	154	4.96	556	42	6	16	1368.2	1,472	754	152	616	32		6,079	30	3.66	4.05	0.90	1.00	9.1	10.1	1.53	.279	5.64	9.68
11	Pirates	846	2007	162	.420	68	94	162	4.93	997	4	2	32	1447.2	1,627	793	174	518	76	55	6,374	45	6.20	3.22	1.92	1.08	15.6	8.1	1.48	.315	5.26	10.11
12	Pirates	845	1954	154	.344	53	101	154	4.92	525	37	4	15	1346.0	1,510	736	128	564	23		6,023	37	3.51	3.77	0.93	0.86	8.7	9.4	1.54	.289	5.65	10.10
13	Pirates	845	1951	155	.416	64	90	155	4.79	580	40	9	22	1380.1	1,479	735	157	627	31		6,132	27	3.78	4.09	0.93	1.02	9.5	10.2	1.53	.279	5.51	9.64
14	Pirates	835	1897	135	.458	60	71	135	4.67	342	112		2	1153.1	1,397	599	22	318	65		5,092	31	2.67	2.48	1.08	0.17	6.7	6.2	1.49	.316	6.52	10.90
15	Pirates	833	2021	162	.377	61	101	162	5.08	1,312	0	0	25	1396.1	1,400	788	213	606	78	26	6,140	55	8.46	3.91	2.17	1.37	21.4	9.9	1.44	.302	5.37	9.02
16	Pirates	833	1996	162	.451	73	89	162	4.61	1,044	5	2	37	1453.1	1,602	744	183	479	50	50	6,338	62	6.47	2.97	2.18	1.13	16.5	7.6	1.43	.310	5.16	9.92
17	Pirates	817	2022	162	.383	62	100	162	4.66	1,250	0	0	33	1421.0	1,432	735	164	586	87	23	6,263	62	7.92	3.71	2.13	1.04	20.0	9.4	1.42	.304	5.17	9.07
18	Pirates	815	1947	156	.403	62	92	156	4.68	501	44	9	13	1374.0	1,488	715	155	592	27		6,089	29	3.28	3.88	0.85	1.02	8.2	9.7	1.51	.277	5.34	9.75
19	Pirates	806	1993	162	.463	75	87	162	4.77	832	12	4	34	1445.2	1,557	766	153	485	46	43	6,247	55	5.18	3.02	1.72	0.95	13.3	7.8	1.41	.297	5.02	9.69
20	Pirates	801	2003	162	.463	75	87	162	4.64	926	7	3	44	1444.1	1,527	744	178	502	61	58	6,293	50	5.77	3.13	1.84	1.11	14.7	8.0	1.40	.292	4.99	9.52
21	Alleghenys	801	1889	134	.462	61	71	134	4.51	345	125		1	1130.2	1,296	566	42	374	30		5,041	63	2.75	2.98	0.92	0.33	6.8	7.4	1.48	.295	6.38	10.32
22	Pirates	799	1895	135	.538	71	61	135	4.10	383	107		6	1179.2	1,279	537	19	500	85		5,283	44	2.92	3.81	0.77	0.14	7.2	9.5	1.51	.293	6.10	9.76
23	Pirates	797	2006	162	.414	67	95	162	4.52	1,060	2	1	39	1435.0	1,545	720	156	620	70	62	6,354	61	6.65	3.89	1.71	0.98	16.7	9.8	1.51	.312	5.00	9.69
24	Pirates	796	1892	155	.523	80	73	155	3.10	455	130		1	1347.1	1,300	464	28	537	58		5,936	46	3.04	3.59	0.85	0.19	7.7	9.0	1.36	.262	5.32	8.68
25	Pirates	793	1952	155	.273	42	112	155	4.65	564	42	4	8	1363.2	1,395	704	132	625	27		5,992	30	3.72	4.12	0.90	0.87	9.4	10.4	1.48	.272	5.23	9.21