Pawn=Queen chess #puzzle

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Discount code: ALEX10
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I found a solution in 28, but I don't remember the moves...

Edit: I managed to replicate it and got a faster solution, so here's the 26-move solution, using a grid. Columns left to right are A-D, rows top to bottom are 1-4; pawn starts on d4, and queen ends up on a4.
Ra4
Ba3
Rb2
Bb3
Rc2
Bc3
Rd2
d3
Bd4
Rc3
Rdc2
d2
Rd3
Ndc3
d1=Q
Rcd2
Qc2
Nd1
Qc3
Bc2
Qb3
Nbc3
Rb1
Bb2
Ra3
Qa4#

zero-sama