1. I suspect SPD plays a part in the determination of Open or Not Open. I do not know this for sure.
2. SPD play no part in the determination of Catch or No Catch.
10a. Yes -- does the receiver make the catch? (Go to 11)
*** Based on the accuracy of the throw (ease of the catch), and the receiver's hands, athleticism, strength, and technique.
3. SPD plays a part in the determination of an immediate tackle or whether the WR runs after catch.
12a. Yes -- receiver tackled.
*** Whether or not the receiver is tackled or the run continues is based on defensive positioning, receiver's speed, elusiveness, athleticism, and strength, and defender speed, athleticism, game instinct, tackling, and technique.
My information comes from the old passing algorithm in the JConte interview from many years past posted at GDReports. I suspect the program is still the same, but do not know this for a fact.
Good luck.
nitros (James)