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INVALID SIZE error message

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INVALID SIZE error message

by Elf » Thu Dec 18, 2025 11:52 am

I’m testing a strategy laying the field. I’m using LAYSP and each selection has an individual Liabilty. When Market Replay accepts the bets, often at In Play, it cancels all bets with the error message INVALID SIZE. It appears random, the Liability is always above minimum. I can’t work out any reason. It happens to about 20% of the markets. Any help would be appreciated.

Elf: Posts: 14; Joined: Thu Aug 30, 2018 11:37 pm

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Sports betting software from Gruss Software

The strength of Gruss Software is that it’s been designed by one of you, a frustrated sports punter, and then developed by listening to dozens of like-minded enthusiasts.

Gruss is owned and run by brothers Gary and Mark Russell. Gary discovered Betfair in 2004 and soon realised that using bespoke software to place bets was much more efficient than merely placing them through the website.

Gary built his own software and then enhanced its features after trialling it through other Betfair users and reacting to their improvement ideas, something that still happens today.

He started making a small monthly charge so he could work on it full-time and then recruited Mark to help develop the products and Gruss Software was born.

We think it’s the best of its kind and so do a lot of our customers. But you can never stand still in this game and we’ll continue to improve the software if any more great ideas emerge.