West Brom boss Sam Allardyce admits relegation is closer after defeat to West Brom.
Palace captain Luka Milivojevic scored the game's only goal from the spot after Darnell Furlong was adjudged to have handled Wilfried Zaha's cross, leaving the second-bottom Baggies eight points clear of safety with nine matches left to play.
"There's 27 points available and 20 needed," Allardyce told Sky Sports. "We can only really afford to drop seven points.
"I'm left frustrated because of the players' efforts not being rewarded, and that's a consistent analysis from me."
The Baggies rarely looked like salvaging a point at Selhurst Park, their only shot on target coming courtesy of Mbaye Diagne 18 minutes from time.
"That shows where our problems have been," Allardyce added. "We had 12 shots and only one on target.
"At the end of the day you need a natural goalscorer. When you have one, he finds a way to be in the right areas and he doesn't need more than one opportunity to score.
"We're defending superbly well and our football leading up to the final third is excellent. We need more responsibility to not only score, but to hit them on target."
