Adam Wheeler: GB have dominated most of the possession in the hockey. But NZ look very dangerous on the counter.

End of the first stanza, scoreless after 15 minutes. GB have had more pressure, but the Kiwi attacks have been more potent.

The surface is wet. Every time a stick sweeps the ground, water sprays. NZ attacking at the end of the quarter...

Image source, PA

Here's that early clanger from German goalkeeper Timo Horn as he makes a total hash of his attempted clearance.

But he managed to recover. Just about.

Germany lead with an hour gone. 

Luke Reddy
BBC Sport in Rio

"Ladies and gentlemen, as a courtesy to the players, no whistles from the crowd thank you."

That's the message from the announcer here.

It's not exactly Green Street just yet. Great Britain fans and New Zealand followers sit side by side and make a decent noise.

I've ended up by the New Zealand media and they start getting excited as their side flash a penalty corner wide. Sit down ladies and gents, nothing to see here. This one is just brewing...

Saved! Crista Cullen's shot, hitting the pads of the Kiwi keeper. Tighter than a wrestler's belt, this one. 

At the other end, GB penalty corner...

This is better from New Zealand, who get the first genuine attempt from open play. Through the middle, Gemma Flynn lurking at the back post, but can't get a touch.

Image source, BBC Sport

Heading into the fifth round and Tonia Couch is well placed to qualify. She is fourth with a total of 268.40 points while Sarah Barrow (216.60) is down in 22nd.

See how they get on in their final dives here.

The GB defence don the Hannibal Lecter masks, ready to throw body in front of ball. The corner comes in, the shot, but it's just wide.

Mel Clewlow
Ex-GB hockey player on BBC One

Kate Richardson Walsh was looking for the long pass out of defence and she probably got caught in two minds.

It is not often you see her make those mistakes.

Penalty corner to NZ. In what seems like their first attack, there's confusion in the GB defence. Kate Richardson-Walsh caught out. Danger.

Image source, Reuters

It's break-neck stuff. Think a high pressing game, rather than tiki-taka. Lily Owsley gets an inch of space and tries a backhand shot, but she can't get it away. All GB at the moment.

Germany were sloppy in the final 20 minutes of the first half but they have come flying out of the traps in the second half.Arsenal winger Serge Gnabry has a stinging drive turned away before Davie Selke skips around the keeper - tight angle - and his cross/shot is cleared.

Green card. NZ's Kayla Whitelock with a stick tackle on Sophie Bray. Two minutes in the bin. GB a player to the good.

GB trying to get down the right once more, Helen Richardson-Walsh and Susannah Townsend. Just squeezed out. New Zealand can't get out of their own half.

Hockey is a rapid sport. At any dead ball situation, players aren't required to pass, they simply collect the ball and run. Keeps the pace high. GB penning the Kiwis in, boxed into the far left corner. Red all over black at the moment.

Mel Clewlow
Ex-GB hockey player on BBC One

The game has started at a cracking pace. 

If it continues like this we are going to be in for a treat.

GB right to left as we look on. Most of the field is in shade, only the fans in the far stand are bathed in sunshine. Susannah Townsend tries to wriggle through, but is shut out by those in black.