Macclesfield narrowly missed out at Priory Park as Richmond took home a 19-15 victory.
The Blues fought hard to keep a valuable bonus point, however it was the London side that came out on top.
"We couldn’t build our game because we constantly allowed the ball to be turned over," said head coach Geoff Wappett. "It’s been our enemy all season.
"Yes, in between some frustrating pieces we played some really good rugby, with some good support but always seemed to be coming up short.
"We conceded two poor tries from lineouts that should have been stopped at the source."
Richmond opened the scoring after eight minutes when their captain William Warden carried the ball over the line in a maul.
Louis Grimoldby was on target with the conversion to give the visitors a 7-0 lead.
Several chances for Macclesfield were stopped short as the Blues held possession and searched for a way through.
Richmond’s defence held strong though, and soon the ball was turned over with a counter on the left wing blocked by Blues’ full-back Jack Moorhouse.
After 20 minutes Ed Stobart caught the opposition off guard, using his pace to blast past the defence and add his name to the scoresheet and make it 7-5.
Richmond winger Will Browne gave Blues supporters a scare as he came close to latching onto a ball into space down the right wing. Moorhouse’s desperate dive putting it to safety.
Ten minutes before half-time Richmond took advantage of their set-piece routine once again as Harrison Edwards touched down from a driving maul down the right wing to put the Londoners 12-5 up.
On the half-time whistle the Blues levelled, as Dave Marwick’s try was converted by captain, Tom Eaton.
Just two minutes into the second-half Richmond were awarded a penalty try for a foul conceded in a scrum.
Grimoldby converted to give Richmond a seven-point lead as the visitors continued to threaten.
Eaton’s penalty after 55 minutes was the consolation that gave Macclesfield a valuable bonus point.
The two sides were held at a stalemate for large periods of the second half, both sides coming close on several occasions.
The Blues were met with an injury-time push as Richmond hunted for a fourth try, but Macclesfield defended well to keep the full-time score at 19-15.
A disappointed Wappett insisted: "We damaged ourselves in the first 10 to 15 minutes; it’s easy for people to forget those minutes. We had most of the ball, we were playing quite tidily and we were looking alright but we also lost the ball with amazing consistency.
"In early stages of plays we were losing the ball and couldn’t build on the play. Despite this we got two good tries and at half-time it was 12-12.
"I thought Matt O’Regan looked very dynamic out wide, we needed to get it to him more often because he was having a good day.
"The set-piece defence at the two lineouts was poor; as the ball’s thrown in and caught the person responsible there should have put the catcher to the ground immediately.
"However we allowed the maul to establish and the tries were scored, we should have done better there."