Tata Steel Challengers: Kovalev out in front

Vladislav Kovalev has won three in a row and takes a half point lead into Sunday's final round. Maksim Chigaev and Andrey Esipenko remain undefeated and a half point back. But Kovalev has the easiest pairing in Round 13 — White against the bottom seed Stefan Kuipers — while the young Russians both have Black against tougher opponents. We take a closer look at the past week in the Challengers. | Photo: Alina l'Ami

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