DACCA, Pakistan, March 19 — The first apparent break in the tense deadlock between the two feuding sections of Pakistan came today with a clear indication of movement in :the talks between the leader of East Pakistan, Sheik Mujibur Rahman, and the President of Pakistan, Agha Mohammad Yahya Khan, over. East Pakistan's demand's for self‐rule.

Sheik Mujib emerged from his third talk this week with President Yahya, beaming and in good spirits, to report that his advisers would meet to night with the President's aides to try to work out a “formula,” and that tomorrow morning he and six of his party leaders and advisers would meet with the President and his advisers.

This was the first time that the staffs on both sides had been called together officially for a working‐level meeting.

It was also the first time that Sheik Mujib appeared pleased after one of the meetings with the President.

As the 51‐year‐old Bengali leader rode out of the heavily guarded presidential compound in his white Toyota, hundreds of ebullient, dancing students swarmed around the car and shouted the words that have be come the slogans of his move ment: “Shadhin Bangla Desh!” —Independent Bengal Nation! and “Joi Bangla!”—Victory for Bengal!

Despite the apparent movement toward an agreement on what degree and form of self rule East Pakistan will have, the volatility of the situation made predictions of a solution seem premature. The course of the dispute—which centers on East Pakistan's struggle to end the domination by West Pakistan over its affairs—has always been so mercurial that knowledgeable sources here re fused to rule out the possibility that the talks could still break down.

There was one disruptive incident today. Some Bengali civilians were killed in a clash of unknown origin with West Pakistani troops in Joydevpur, 25 miles north of Dacca.

East and West Pakistan are separated not only by 1,000 miles of Indian territory, but also by their completely different cultures, languages and diet. Their only common link is religion, Islam, which was the basic reason for creating this bifurcated nation in 1947.

No details have filtered out of the talks. The secrecy on both sides has been rigid. But most reliable sources here thought it unlikely that Sheik Mujib would send his top advisers to a meeting with President Yahya's advisers and also commit himself to a meeting tomorrow accompanied by his high commend if the talks had not reached the document drafting stage. The speculation here is that some tentative agreement in principle has been reached.