Le Quang Liem and Pentala Harikrishna are sharing the lead with 3 points after 4 rounds at the Masters section of the Prague Chess Festival. The two co-leaders have three players standing a half point back going into the event’s one rest day. Meanwhile, Vincent Keymer is the sole leader in the Challengers section, also with 3 out of 4. | Photo: Petr Vrabec