20250301 1432 white#2 very good to analyze

FEN

7K/8/8/8/8/4R3/k6p/BRb4Q w - - 0 1

Hindi Chess Talkschess

1.Rb6! 🔑

1- If 1...Kxa1 2.Ra3#

2-If 1...Bb2+ 2.Rxb2#

3-If 1... Bxe3 2.Qa8#.

1- if 1...Ka1 2. Ra3#  Bc1 is pinned by wht Qh1 to blk Ka1 &  cannot defend on a3 square or a open discovery check from Wht Qh1 will occur. Illegal defense move. So Rb6 covers b- file & Ra3 has blk Ka1 in check with no escape results in a checkmate in 2 

2-If 1...Bb2+ 2Rxb2# Rb2 has blk Ka2 in check & covered by Ba1. Ba1 is protected by Qh1 as Re3 covers a3 square for a check. Ka2 is in check & no escape results in a checkmate in 2.

3-If 1... Bxe3 2. Qa8#.  Be3 can't block or stop Qa8 checkmate because Rb6 is blocking. 

Rb6 cover all b- file & Qa8 covers a-file & Has Ka2 in check with no escape results in a checkmate in 2.

Why Ra6

1. Rb3 isn´t mate in 2 Kxa1 2. Qxc1+ Ra2

1. Rb4 isn't mate in 2 Bxe3 2.Qb1+ Ka3

1. Rb5 isn't mate in 2 because de Bishop bloq the Queen attack