NL1000 shortstack - should I bet river here...?

[LSP16]

Hand 2101756479, Started at 20/09/2007 14:00:55 - Blinds : 0 / 0

Seat 0 : vilain (41000 in chips)
Seat 1 : LSP16 (38900 in chips)

ANTES/BLINDS
LSP16 : Dealer
LSP16 : Post Blind (500)
vilain : Post Blind (1000)
Dealt to LSP16 :

PRE-FLOP
LSP16 : Raise (2500)
vilain : Call (2000)

Pot : 5900 (rake : 100)


FLOP


fish4life : Check
LSP16 : Bet (3500)
vilain : Call (3500)

Pot : 12900 (rake : 100)


TURN


vilain : Check
LSP16 : Check

Pot : 12900 (rake : 100)


RIVER


vilain : Check
LSP16 : ????