The FEI says it is investigating after some riders have risen a number of places on the ranking lists after competing at shows which had very few competitors
The FEI is under pressure to void Olympic jumping places secured at last-minute tours that had invited handsful of riders.
Some classes last month at Villeneuve-Loubet in France and Damascus, Syria, involved just five riders, one of whom won rankings points with a 28-fault round.
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