My professor tends to say we're really using BJJ when we're exhausted. When we're fresh, we're explosive and strong. When you're tired, it really forces your technique to come through. It was a nice observation seeing this come into play today. I rolled with a military combatives instructor for probably 20 minutes straight with no submission. I positionally dominated him but he had more upper body strength and finagled out of a couple attempts of mine (non-locked triangle, an arm triangle, and I might've gotten an arm bar on him but ran into a wall). He asked for the break and we were both exhausted. We stopped for a minute or two and went at it again and I submitted him twice in probably about 5 min. It was a game of attrition and when the strength was gone it was my technique that won through. As an addendum, this was no-gi and I train almost exclusively in the gi. I'm hoping to do more no-gi in the future but it really highlighted the differences for me. All of my "grips" and collar chokes were gone... It felt like showing up for a job and having to constantly look back into my tool bag for another tool.