Everton boss Roberto Martinez said he was feeling "pure anger" after his side were denied victory by a controversial 98th-minute Chelsea equaliser.
John Terry was a yard offside when he salvaged a point for Chelsea in a pulsating 3-3 draw at Stamford Bridge.
Martinez, whose side were leading 2-0 and 3-2, said the officials had made two "major errors" as Terry's goal came after the allocated seven minutes of added time.
"It's heartbreaking," he added.
"Seven minutes of injury time, the last action happens in 97 minutes 51 seconds and John Terry is two yards offside.
"Maybe refs need a bit of help. But to have a player two yards off in the box is unacceptable.
"There is no explanation. It's a big, big error. It's not good enough."
Everton took the lead when Terry put through his own net before Kevin Mirallas sent the visitors 2-0 up.
Diego Costa reduced the margin and Cesc Fabregas's deflected shot made it 2-2.
The Toffees thought they had won it through substitute Ramiro Funes Mori in the 90th minute only for Terry to back-heel in from close range.
Everton are without a win in their past four Premier League games and have one win in nine.
Chelsea's interim manager Guus Hiddink suggested he might have spoken to the referee, Mike Jones, and told him to play additional stoppage time after Everton went 3-2 up.
"There was seven minutes extra time. I said to the fourth referee, 'OK they are celebrating at least one minute in the corner'."
Hiddink also admitted Terry's last-gasp equaliser was offside.
"[Martinez] is quite right, he was offside.
"Sometimes it's in our favour, I've seen it. Oscar touched the ball and John was offside but he made a beautiful goal."