128mb hash each
3-4-5 piece tablebases
40 moves in 25 minutes repeating (adapted for the CCRL)
All engines 32-bit 1CPU
2 cycles 38 rounds
The top engine will gain automatic promotion. The second top engine might play a grading match to determine which division it will play in for the next series.
BigLion 2.23x (included to even the numbers)