We recently ran the Mechili scenario (#17 from the Operation Compass publication) as an introduction to the tank vs tank rules. Table is open desert with the Italian end higher than the British. We fought the battle using 10mm miniatures.
Victory depends on tanks destroyed and functioning tanks being more than half way down the table. The Italians were up 30 points to 6 when we ended the game.
The British had lost seven light tanks due to them emulating the charge of the light brigade, and the first troop of A13s that arrived on table were chewed up by a unkind run of cards. The deck at that stage was very biased in favour of the Italians with twelve unit activation cards compared to the two for the Brits.
Here's some more detail of the action: