[{"tid":1,"matches":[{"dord":1,"matches":[{"tord":1,"score":11},{"tord":2,"score":12}]},{"dord":2,"matches":[{"tord":1,"score":21},{"tord":2,"score":22}]}]}]

db.collection.update({"tid":1},{$set:{"matches.$[m].matches.$[t].score":100}},{arrayFilters:[{"m.dord":1},{"t.tord":1,"t.score":11}]})