Author: allan johnson
Date: 19:59:24 10/23/99
Go up one level in this thread
On October 23, 1999 at 13:13:49, Peter Kappler wrote:
>On October 23, 1999 at 09:29:20, Manuel Monasterio wrote:
>
>>On October 23, 1999 at 04:12:51, Peter Kappler wrote:
>>
>>>
>>>I reached this position as Black in a blitz game tonight.
>>>
>>>8/1p6/5k1n/8/4P3/5P2/3K4/8 b - -
>>>
>>>My first thought: "Cool, I've reached a winning ending."
>>>5-10 seconds later: "Hmmm, I actually have to play precisely."
>>>2 moves later: "Geez, this looks really tough to win, now."
>>>5 moves later: "Well, at least I can give up my knight and draw..."
>>>
>>>At first I was annoyed with myself, but after fiddling around with the position
>>>very briefly with Genius 6 and Hiarcs 7.32, I'm not certain Black can win. Both
>>>programs give big positive scores for Black, but I'm not sure they are
>>>understanding the position completely.
>>>
>>>I'm too tired to do any real analysis tonight. My hope is that I'll wake up in
>>>the morning, and find the answer posted here. :-)
>>>
>>>
>>>--Peter
>>
>>Hi Peter, I am eager to help you on this, but excuse my ignorance, I don't
>>understand the notation, could you tell me where can I find the translation into
>>algebraic? Thanks
>
>
>
>Hi Manuel,
>
>The notation I used is called EPD (Extended Position Description) which is an
>extension of a previous standard called FEN (Forsyth-Edwards Notation).
>
>Unfortunately, I can't find the URL to the complete spec (and the entire
>document is a bit large to post), but here's the significant info:
>
>
>4.1: Piece placement data
>
>The first field represents the placement of the pieces on the board.
>The board contents are specified starting with the eighth rank and
>ending with the first rank. For each rank, the squares are specified
>from file a to file h. White pieces are identified by uppercase SAN
>(Standard Algebraic Notation) piece letters ("PNBRQK") and black
>pieces are identified by lowercase SAN piece letters ("pnbrqk").
>Empty squares are represented by the digits one through eight; the
>digit used represents the count of contiguous empty squares along a
>rank. The contents of all eight squares on each rank must be
>specified; therefore, the count of piece letters plus the sum of the
>vacant square counts must always equal eight. The solidus character
>"/" (forward slash) is used to separate data of adjacent ranks.
>There is no leading or trailing solidus in the piece placement data;
>hence there are exactly seven of solidus characters in the placement
>field.
>
>The piece placement data for the starting array is:
>
>rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR
>
>
>4.2: Active color
>
>The second field represents the active color. A lower case "w" is
>used if White is to move; a lower case "b" is used if Black is the
>active player.
>
>The piece placement and active color data for the starting array is:
>
>rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w
>
>
>4.3: Castling availability
>
>The third field represents castling availability. This indicates
>potential future castling that may or may not be possible at the
>moment due to blocking pieces or enemy attacks. If there is no
>castling availability for either side, the single character symbol
>"-" is used. Otherwise, a combination of from one to four characters
>are present. If White has kingside castling availability, the
>uppercase letter "K" appears. If White has queenside castling
>availability, the uppercase letter "Q" appears. If Black has
>kingside castling availability, the lowercase letter "k" appears. If
>Black has queenside castling availability, then the lowercase letter
>"q" appears. Those letters which appear will be ordered first
>uppercase before lowercase and second kingside before queenside.
>There is no white space between the letters.
>
>The piece placement, active color, and castling availability data for
>the starting array is:
>
>rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq
>
>
>4.4: En passant target square
>
>The fourth field is the en passant target square. If there is no en
>passant target square then the single character symbol "-" appears.
>If there is an en passant target square then is represented by a
>lowercase file character (one of "abcdefgh") immediately followed by
>a rank digit. Obviously, the rank digit will be "3" following a
>white pawn double advance (Black is the active color) or else be the
>digit "6" after a black pawn double advance (White being the active
>color).
>
>An en passant target square is given if and only if the last move was
>a pawn advance of two squares. Therefore, an en passant target
>square field may have a square name even if there is no pawn of the
>opposing side that may immediately execute the en passant capture.
>
>The piece placement, active color, castling availability, and en
>passant target square data for the starting array is:
>
>rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq -
Beautifully explained Peter
Rabbits
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