p.boxed
- | Pawns start on the 7th rank. Move a knight to promote them.
-
-h3 Divergences
-
-p No castle, no en-passant capture.
+ | Pawns start on the 7th rank. Move a knight to promote them.
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.
+ ...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.
+ 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.
+ 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#
+ .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#
+
+p Note: in the standard initial position, kings and knights are not neighbors.
h3 Source
p
- | See for example the
- a(href="https://www.chessvariants.com/diffsetup.dir/upside.html") Upside down chess
- | page on chessvariants.com.
+ | See for example the
+ a(href="https://www.chessvariants.com/diffsetup.dir/upside.html")
+ | Upside down chess
+ | page on chessvariants.com.