Costa Rica, who played a waiting game keeping their defence compact, took the lead in the 26th minute through Yecxy Jarquin.
Guinea dominated the match creating several scoring changes but were denied by rival keeper Ricardo Montenegro until Fondje Toure restored parity in the 30th minute.
Costa Rica once again took the lead after the change of ends through Andre Gomez taking advantage of the shaky rival defence in the 67th minute. But the African side kept on pressing hard until defender Ibrahima Soumah scored the equaliser in the 81st minute.
The draw kept both the teams' hopes alive as they have one point each. Costa Rica play their next match on October 13 here against Iran while Guinea travel to Kochi to play their last match against Germany.
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It was Guinea who looked more dominant in the first half as they attacked with steady flow of passes and came close to scoring twice in the first 20 minutes forcing keeper Monenegro to make diving saves off Fandje Toure and Aquibou Camara.
A move on the left saw Andres Gomes making his way deep inside the box and sent a cross which Yecxy Jarquin just tapped into the net after the defenders failed to intercept the ball.
Referee Robert Madden then allowed cooling break for the teams and this helped Guinea as they retaliated and found the equaliser soon after the break in the 30th minute. Naby Bangoura took a bi-cycle kick from inside the box which keeper Montenegro blocked but the rebound came to Fandje Toure who shot home from close.
The Guinea trio of Fandje Toure, Seydouba Cisse and Naby Bangoura combined well and kept the attack going on after change of ends and Costa Rica keeper once again had to make saves off Fandje Toure and substitute Djibril Sylla.
Costa Rica came up with a counter attack and surge ahead in the 67th minute. A move from the middle saw Yecxy Jarquin taking a shot which Guinea keeper Mohammed Camara managed to parry, but the ball came to Andrez Gomez who headed in.
Thereafter Guinea pushed four forwards as they made all out effort in search of the winner but Costa Rica keeper Ricardo Montenegro turned out to be the hero bringing off smart saves to deny the African the victory.
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