Separate client and server codes. Keep everything in one git repo for simplicity

[vchess.git] / client / client_OLD / views / rules / Upsidedown / en.pug

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+p.boxed
+       | Pawns start on the 7th rank. Move a knight to promote them.
+
+h3 Divergences
+
+p No castle, no en-passant capture.
+
+p.
+       ...Only the initial position changes, but this makes a huge difference.
+       In particular, castling would be rather pointless so it's disabled here.
+       En-passant captures are impossible because all pawns already reached 7th rank.
+
+h3 About the initial position
+
+p.
+       Since truly random start can allow a mate in 3 with a knight,
+       the kings have at least one knight neighbor in the initial position.
+       This allows to move free out of potential check from the very beginning.
+
+p.
+       A less constraining condition would be to require the two knights to stand on
+       two squares of different colors, but it's not enough as proved by the
+       following diagram.
+       White can mate in 3: 1.Nc6 followed by Nb4 threatening both a2 and d3.
+
+figure.diagram-container
+       .diagram
+               | fen:RBN1BRRQ/PPPPPPP/8/4n3/8/8/Nppppppp/brkbqr1n:
+       figcaption After 1.Nc6 Nf3 2.Nb4 Ne5 (covers d3 but not a2) 3.Nxa2#
+
+h3 Source
+
+p
+       | See for example the 
+       a(href="https://www.chessvariants.com/diffsetup.dir/upside.html") Upside down chess
+       |  page on chessvariants.com.