FACTBOX - What's next in Zimbabwe's political crisis?

(Reuters) - Zimbabwe's main opposition Movement for Democratic Change (MDC) party won the vote for parliament speaker on Monday, dealing a blow to President Robert Mugabe in a post-election power struggle.

But Zimbabwe's balance of power remains delicate.

Here are some questions and answers on Zimbabwe's political uncertainty.

WHAT IS THE BALANCE OF POWER?

ZANU-PF won a later vote for the presidency of the upper house of parliament, the Senate -- where it has a majority -- meaning it can block legislation passed by parliament.

The MDC, with support from MPs of a breakaway faction, can pass some bills in the lower house but these can be blocked in the Senate.

HOW WILL THE MDC BENEFIT?

The election of the MDC's Lovemore Moyo to Speaker of the Lower House of Assembly -- one of the most post powerful positions in Zimbabwean politics -- will strengthen party leader Morgan Tsvangirai's position in deadlocked power-sharing talks.

WHAT'S MUGABE'S NEXT MOVE