Calcutta, July 25 :     Fifth-seeded Sayantan Dutta of Kendriya Vidyalaya, Fort William, halted overnight leader Yashpal Singh Sonwani's string of victories in the sixth round of the Fide-rated The Telegraph Schools' Chess Championship at Gorky Sadan today. In a drawn end-game Yashpal blundered and allowed Sayantan to set up a winning king-and-pawn ending. Sayantan, now jointly leads the field along with Saptarshi Roy and Gulam Mustafa Bhuiyan of Bangladesh with 5.5 points. Top seed Saptarshi made short work of Yamben Dhanabir Singh of Manipur in 27 moves in Modern defence. Saptarshi won a pawn in the middle game and then made good use of his excellently placed pieces to win. Unrated Nilabh Upadhyay of Sunrise School, Howrah, rose to the occasion once again to hold the second seed and national under-12 boys' champion Deep Sengupta of S-E Railway Eng. Medium School, Chakradharpur to a draw in Sicilian Defence. Yesterday Nilabh had drawn against the top seed. Paramita Ghosh of Salkia GHS, who had excelled in the earlier rounds, went down to Mustafa in 43 moves in the Centre-Counter defence. Paramita had beaten the Bangladesh junior No. 2 Ejaz Hussain in the last round. Paramita mishandled the double rook and pawn ending which cost her the rook and the game. Tanmoy Patnaik of Mitra Institution, Sealdah, held the Jamshedpur leg champion Rohan Vijay Shandilya to a draw in 26 moves in the Scotch opening. Somak Palit of Mitra Institution, Bhowanipore was held to a draw by former national under-10 champion Rahul Sangma of Bihar in a game of fluctuating fortunes. In a French defence Rahul, playing black, blundered, but a counter-blunder by Somak gave him hopes of a draw. The game continued till the 41st move when the peace treaty was signed. In an upset of sorts Souparna Ghosh of Don Bosco drew with Samput Mallick of Holy Home, Serampore. Souparna was clearly with a superior position in the middle game but he led Samput off the hook and allowed him to break to a draw. Horlicks have announced a Best Game prize in this meet. Participants who want to claim the prize must give their names to the chief arbiter by July 30. Former India captain Bishan Singh Bedi will be chief guest at the prize distribution ceremony to be held from 4.45 pm on July 31 at G.D. Birla Sabhaghar TOP BOARD RESULTS Yashpal Singh Sonwani lost to Sayantan Dutta, Saptarshi Roy bt Yamben Dhanbir Singh, Deep Sengupta drew Nilabh Upadhyay, Paramita Ghosh lost to Gulam Mustafa Bhuiyan, Somak Palit drew Rahul Sangma, Pratik Sengupta bt Sourab Bose, Tanmoy Pattanayak drew Rohan Vijay Shandilya, Santu Mandal drew Syed Rownak Ehsan, Mufidul Islam Khan lost to Rajib Dhar, Dhrubba Manna drew Joydeep Dutta, Arindam Das lost to Sashank Singh, Abhijit Kar lost to Mary Ann Gomes, Lairenjam Mahesh Singh lost to Sayan Sarkar, Sanjoy Banerjee lost to Ejaz Hussain, Souparna Ghosh drew Samput Mallick, Gurumayum Inao Sharma drew Arpan Chakraborty, Soumya Talukdar lost to Swagatam Sengupta, Suman Bosu drew Soumya Thakurta, Nazir Saleheem drew Akash Kusum, Pranjal lost to Arin Kumar Biswas, Abhishek Das drew Abhinaba Ghosh, Seikh Shahid Ahmed drew Shourab Das, Debaditya Sinha Biswas bt Peetak Mitra, Punit Jaiswal bt Swapan Das.