San Francisco 49ers Offensive Formations Singleback Bunch X Nasty Deuce Close Tight Y Off Tight Y Off Flex Wing Close Wing Pair Wing Slot Wing Tight Nasty Wing Tight Z I Form Close Slot Close Tight Twin TE Y Off Close Pistol Deuce Close Strong Y Off Close Shotgun Bunch X Nasty Bunch Y-Flex Deebo Package Deuce Close Doubles Y-Flex Empty Base Flex Flex Y Off Close Slot WR Backfield Split Close Split Twins Stack Tight Base Flex Tight Y Off Tight Y Off Wk Trey Open Trey Y-Flex Y Trips Wk Strong I Wing Defensive Formations 4-3 Even 6-1 Over Over Solid Over Wide 5-2 Normal Nickel Double Mug Over Wide Dime Normal Dollar 3-2 Prevent 3 Deep Goal Line 5-3 6-2