Thanks for all of the replies.
At the time that the hand occurred, my image at the table was certainlty that of a pretty terrible player. I'm relatively inexperienced at playing at the £300 comp level and i had been put under a lot more pressure than i'm used to, right from the start. I had also played a couple of hands quite poorly, although nothing too disastrous.
After flopping the nut flush, my immediate thought was that this was a chance to redeem myself, get all of the chips in the middle, and get back in with a shot at winning the tournament.
Although the original raiser (UTG+2) had literally just joined the table, i believed that my donk bet on the flop would look pretty weak and, hopefully get some action.
When the original raiser flat called and the Button then re-raised to 3500 i thought, happy days. I realised that flat calling would look very strong, but that the button in particular might view it as yet another bad play, putting me on a nut or second nut flush draw.
So i flat called, on the basis that i was never going to fold, and that the original raiser might stick around too.
As it happend, UTG+2 did fllat call the re-raise.
The turn came a pretty harmless looking
I checked the turn, in the mistaken belief that either one ,or hopefully both, of my opponents would be betting the turn.
They both checked behind.
The river came the
pairing the board.
I was pretty unhappy with this card, to put it mildly.
I then jammed the remainder of my chips in on the river, on the basis that i had already committed to going all of the way with the hand. I felt that if i checked it would allow a hand that i was ahead of, such as a smaller flush, to check behind, whereas if one of my opponents did have a full house they were going to put me all in anyway.
UTG+2 flat called my shove and the button folded.
UTG+2 showed
for quads, knocking me out of the tournament.
I tend to agree that, with my stack size, i should have just jammed all in on the flop. I think JK's reply sounded about right.
I'm not sure whether anybody would consider folding after the dreaded pairing of the board on the river.
Either way, hopefully i will learn something from the experience, which is the sole reason that i've posted it on here.
I will try and get back to DTD for another deeepstack soon, as well as Blackbelt Live in November. Hopefully, a little wiser and a lot better prepared, mentally and phsicallly for the battle ahead.
Cheers again for the feedback