Coventry remain eight-points clear at the top of the Championship - despite dropping points for the second successive match.
Frank Lampard's side were held to a 1-all draw at Charlton - but their promotion rivals Middlesbrough lost 1-nil to Derby.
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Ipswich are up to second following their 2-1 victory over Oxford United.
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Earlier, Wrexham moved up to 8th with a 2-0 away win against Blackburn