• Fide row escalates over world No 1’s Freestyle Grand Slam
• Arkady Dvorkovich ‘reneged on promise’ to step down

Freestyle Chess Grand Slam tour head Jan Henric Buettner and world No 1 Magnus Carlsen have called on International Chess Federation (Fide) president Arkady Dvorkovich to resign after talks over an agreement about the new series fell through.

Last month, Fide warned the Freestyle Chess Players Club, which is co-owned by Buettner and Carlsen, that they should not brand the series as a “world championship”. Buettner said he negotiated with Dvorkovich until the early hours of Monday, only to hear from the president that the Fide council would not agree to a deal.