Goalkeeper Daniel Moos, aged 16, made several strong saves. And it was a fine solo goal at the start of the final period by another 16-year-old, Josh Barrett, that effectively killed off the York challenge. Barrett shrugged off a couple of would-be tackles before firing home from close range.
After winning twice on day one, Coventry went down 11-9 to Caledonia Storm, who dominated the early stages to lead 6-2. Coventry were the better side later on but missed a number of chances.
Sedgefield, who beat Sheffield Dolphins 8-2, and Watford were the only teams to take maximum points from their weekend games.
Photos (Trevor Hyde): Above - Caelen Milne, of Caledonia Storm, tackles Matt Williams, of Watford Saxons at Haberdashers. Saxons won the game 15-10.
Below - Good tackle . . . Bridgefield's Jacob Graham (Blue 11) tangles with James Blything, of Invicta Marlins. Graham scored five in Bridgefield's 14-9 victory, giving his side five points from three games over the weekend.