Battlemaps (or battle charts, I keep flitting between the two) are akin to cut down race history charts from a particular driver's point of viewing, showing the distance to the car's immediately ahead and behind in terms of position, and on track.
Here's a selection of battlemaps for some of the drivers for the 2015 F1 Canadian Grand Prix.
First up, Bottas' race: during the first stint he left Grosjean behind, and slowly lost ground to Raikkonen, but it looks as if Raikkonen lost out during the first pit stop and then presumably stopped for a second time. (Did Bottas only one stop? I need to make this clear in the chart somehow....) In the last fifth of the race, Rosberg just marched off into the distance ahead.
Here's how it looked from Raikkonen's perspective:
In the first stint, Rosberg eased ahead, and Bottas slipped behind. In the second stint, Bottas grabbed the advantage and held it steady. In the third stint, Raikkonen made gains on Bottas following the second stop but not enough to pose any real threat. In the second and third stints there was no real competition from behind.
So what happened to Grosjean? Left behind by Bottas in the first stint, Grosjean did the same to Hulkenberg behind. From about lap 25, the situation changes (first stop?) and Grosjean charges down Massa. He can't make progress on Raikkonen either before or after Raikkonen's second stop, but manages to keep Maldonado a safe distance behind. Is there then a second pit stop right at the end of the race?
Finally, let's see how Max Verstappen fared. Despite a battle with Nasr ahead in the first stint, Merhi was left well behind. having cleared Nasr, his superior pace showing as Nasr tailed off behind, Verstappen took on Alonso, passing him in seven laps and setting his sights on Sainz. From about lap 28, Verstappen is losing ground on Hulkenberg ahead, and to Kvyat threatening behind, and then Perez. Meeting up with Alonso again, he's lapped by Bottas, and encounters backmarkers Merhi and (later) Stevens, before passing Alonso for a second time. Despite making small gains on Ericsson, he's to far behind to make much further progress, but at least he's safe from Nasr behind, who only goes backwards.