Table:
text: Flying Childers
Summary
Summary
Race_name Dist_miles Course Prize Odds Runners Place Runner_up
Match race v. Speedwell 4 Newmarket 500 guineas not known 2 1 Speedwell
Match race v. Speedwell not known Newmarket 500 guineas not known 2 1 forfeit
Trial v. Almanzor and Brown Betty 4 Newmarket none not known 3 1 not known
Match race v. Chaunter 6 Newmarket 1000 guineas not known 2 1 Chaunter
Race v. Stripling and Bridgewater`s Lonsdale Mare not known Newmarket 100 guineas not known 3 1 forfeit
Match race v. Bobsey not known Newmarket 100 guineas not known 2 1 forfeit

Question: What race among the Flying Childers had a distance of 4 miles where the runner-up was not known?