Reading Antony Beevor's The Fall of Berlin: 1945 and a short section of a chapter talked about Soviet preparations for chemical warfare. What if Hitler had given permission to use the Verzweiflungswaffen 'weapons of despair' against the Soviet bridgeheads on the Oder, or during their advance against Berlin.
Did the Wehrmacht's have enough chemical munitions or bombs to actually use on? If so, I would think this would have serious disrupted Zhukov's and Konev's attacks. From what was described in the book the Russian CW protection methods aside from gas masks didn't sound very effective. Would the Russians have been delayed enough, for Eisenhower to consider moving further west than he did OTL?
Even if he Ike doesn't go west, how does this change the battle of Berlin?
EDIT: Could the Soviets responded with their own CW attacks against Army Group Visuta and 9th Army?