... 112, 1 13 pin risk 33 , 140, 30 8 short at -the- money call and put butterflies 136 short straddle 114 theta 59, 165–9, 30 8 time decay 28, 30 9 time premium 27, 30 9 vega 64, 66, 165–9, 189, 30 9 ... premium 34 exercise and assignment 31 interest rates, dividends and margin vs cash payment 29 30 pin risk 33 , 30 8 put–call parity 232 synthetic/combo 226 volatility skews 204, 30 9stop-loss ... and cash payment vs 29 30 market direction long and short 30 market-makers 233 contract liquidity 194–5 delta neutral 35 , 30 6 puts 22, 30 8 short at -the- money butterflies 137 short at -the- money...