San Francisco 49ersOffensive FormationsI Form Close Pro Slot Slot Close Tight Twin Te Y Off Pistol Weak I Y Trips Shotgun Bunch Wide Doubles Doubles Y-Flex Empty Base Flex Empty Bronco Split Close Tight Trey Trey Open Trey Y-Flex Wing Tight Y Off Trio Wk Singleback Ace Ace Pair Bunch Deuce Close Dice Slot Wing Slot Wing Tight Y Off Trio Strong I Close Pro Y Off Defensive Formations4-3 Normal Over Over Plus Under Wide 9 46 Bear Under 5-2 Normal Dime Normal Dollar 3-2-6 Goal Line 5-3 6-2 Nickel Double A Gap Normal Wide 9 Prevent 3 Deep