TRYC defeated defending premier Rand for the second time this season with a thrilling two-wicket win in the final over at Yerong Creek on Saturday.
The hosts sent Rand in to bat and restricted the Pigeons to 9-145 from their 40 overs.
Paceman Ryan Kirkwood led the way with the ball with 3-31, while Brayden Ralston's 43 was Rand's only significant score.
Rand struck in the first over with Ben Willis dismissed for a duck, but TRYC steadied through an inspired knock of 54 from skipper Todd Hannam.
However, the stage was set for a dramatic finish as the hosts lost 4-19 in the final overs, with Colin Hagen and Brett Thomas seeing their side home with three balls to spare.
Brayden Lieschke picked up two late wickets to finish with 3-47, while Daniel Lieschke (2-15) and Clint Ralston (2-32) also bowled well.
The result moves TRYC one game behind the Pigeons for top spot.
"It's pretty tight, we could easily beat Rand like we did and come out and lose the nest three, it's that sort of competition," Hannam said.
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Culcairn's Daniel Rooke made 92 to take the Lions to 7-236 and score their second victory of the campaign against Brock-Burrum.
The game looked to be slipping from the Lions' grasp with Brock-Burrum requiring 20 from three overs with three wickets in hand, before Riley Knobel ripped through the tail to finish with 4-33 and bowl the hosts out for 230 in the last over.
Keith Tallent compiled 82, but it wasn't quite enough to get Brock-Burrum home.
"They needed seven off the last over and got a single off the first ball, then Riley Knobel got the last wicket," Culcairn captain Vince Chaffey said.
"We're definitely on the improve and probably should have beaten Walbundrie in the last game, but we've been competitive the last four or five games."
Osborne (3-182) maintained third spot with a comfortable seven-wicket win against Holbrook (5-175), inspired by an unbeaten 57 from Nick Perryman.
Walla skipper Tom Simmons made 78 in his side's 6-222, setting up a 38-run win against Walbundrie (8-184).
An unbeaten 81 from Henty's Shannon Terlich in the total of 3-158 saw the Swampies post a comfortable seven-wicket salute over Lockhart, who were bowled out for 151 after 4-19 from Thomas Newton.
The ladder after round 10 is: Rand 48, TRYC 42, Osborne 42, Walla 36, Walbundrie 36, Henty 30, Lockhart 27, Brock-Burrum 15, Holbrook 12, Culcairn 12.