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'''[[Main Page|Home]] * [[People]] * Paul Wiereyn'''
'''Paul H. Wiereyn''',<br/>
a Dutch [[:Category:Chess Composer|chess problem composer]] and [[:Category:Problem|chess solving engine]] and [[GUI]] programmer.
He is author of a free [https://en.wikipedia.org/wiki/Sudoku Sudoku] program and the [[Windows]] [[GUI]] [[APwin]] for the chess problem solving programs [[Alybadix]] and [[Popeye]].
=0x88=
In his 1985 paper ''Inventive Problem Solving'' <ref>[[Paul Wiereyn]] ('''1985'''). ''Inventive Problem Solving''. [[ICGA Journal#8_4|ICCA Journal, Vol. 8, No. 4]]</ref>, Paul Wiereyn described [[0x88]] coordinates with [[Nibble|nibbles]] for [[Ranks|ranks]] and [[Files|files]] inside a [[Byte|byte]], and used such [[Vector Attacks|square differences]] (mod 256) as table-index to determine [[Pin|pinned pieces]] and [[Discovered Check|discovered checks]] in his problem solving program:
It is obvious to chess-players that a piece when pinned should not be allowed to move out of the direction in which it is pinned. Hence, as a preliminary, we calculate, in one byte, the difference between the coordinates of the piece about to be moved and one's own King, e.g.,
Rd5 - Kf5 <=> 45 - 65 = E0, hexadecimals and reduction modulo 256
being implied throughout.
The difference, E0 say, serves to enter a table T. The tabular value T[E0] so found, when zero, indicates non-collinearity (the pieces are not on the same rank, file or (co-)diagonal). If not zero, the value codes the direction of collinearity, i.e., the pinning direction. In our example the value T[E0] = F0, stands for due West.
=Selected Publications=
<ref>[http://ilk.uvt.nl/icga/journal/docs/References.pdf ICGA Reference Database] (pdf)</ref>
* [[Paul Wiereyn]] ('''1985'''). ''Problem-Solving Ability Tested II''. [[ICGA Journal#8_3|ICCA Journal, Vol. 8, No. 3]]
* [[Paul Wiereyn]] ('''1985'''). ''Inventive Problem Solving''. [[ICGA Journal#8_4|ICCA Journal, Vol. 8, No. 4]]
* [[Paul Wiereyn]] ('''1997'''). ''Genius-3 Cooked Endgame Studies''. [[ICGA Journal#20_3|ICCA Journal, Vol. 20, No. 3]] » [[Chess Genius]]
=External Links=
* [https://alybadix.000webhostapp.com/apwin.htm apwin]
* [http://chesscomposers.blogspot.com/2012/03/march-31st.html Chess Composers: March 31st - Paul H. Wiereyn (31-03-1936) Dutch composer]
=References=
<references />
'''[[People|Up one level]]'''
[[Category:Chess Composer|Wiereyn]]
[[Category:Chess Programmer|Wiereyn]]
'''Paul H. Wiereyn''',<br/>
a Dutch [[:Category:Chess Composer|chess problem composer]] and [[:Category:Problem|chess solving engine]] and [[GUI]] programmer.
He is author of a free [https://en.wikipedia.org/wiki/Sudoku Sudoku] program and the [[Windows]] [[GUI]] [[APwin]] for the chess problem solving programs [[Alybadix]] and [[Popeye]].
=0x88=
In his 1985 paper ''Inventive Problem Solving'' <ref>[[Paul Wiereyn]] ('''1985'''). ''Inventive Problem Solving''. [[ICGA Journal#8_4|ICCA Journal, Vol. 8, No. 4]]</ref>, Paul Wiereyn described [[0x88]] coordinates with [[Nibble|nibbles]] for [[Ranks|ranks]] and [[Files|files]] inside a [[Byte|byte]], and used such [[Vector Attacks|square differences]] (mod 256) as table-index to determine [[Pin|pinned pieces]] and [[Discovered Check|discovered checks]] in his problem solving program:
It is obvious to chess-players that a piece when pinned should not be allowed to move out of the direction in which it is pinned. Hence, as a preliminary, we calculate, in one byte, the difference between the coordinates of the piece about to be moved and one's own King, e.g.,
Rd5 - Kf5 <=> 45 - 65 = E0, hexadecimals and reduction modulo 256
being implied throughout.
The difference, E0 say, serves to enter a table T. The tabular value T[E0] so found, when zero, indicates non-collinearity (the pieces are not on the same rank, file or (co-)diagonal). If not zero, the value codes the direction of collinearity, i.e., the pinning direction. In our example the value T[E0] = F0, stands for due West.
=Selected Publications=
<ref>[http://ilk.uvt.nl/icga/journal/docs/References.pdf ICGA Reference Database] (pdf)</ref>
* [[Paul Wiereyn]] ('''1985'''). ''Problem-Solving Ability Tested II''. [[ICGA Journal#8_3|ICCA Journal, Vol. 8, No. 3]]
* [[Paul Wiereyn]] ('''1985'''). ''Inventive Problem Solving''. [[ICGA Journal#8_4|ICCA Journal, Vol. 8, No. 4]]
* [[Paul Wiereyn]] ('''1997'''). ''Genius-3 Cooked Endgame Studies''. [[ICGA Journal#20_3|ICCA Journal, Vol. 20, No. 3]] » [[Chess Genius]]
=External Links=
* [https://alybadix.000webhostapp.com/apwin.htm apwin]
* [http://chesscomposers.blogspot.com/2012/03/march-31st.html Chess Composers: March 31st - Paul H. Wiereyn (31-03-1936) Dutch composer]
=References=
<references />
'''[[People|Up one level]]'''
[[Category:Chess Composer|Wiereyn]]
[[Category:Chess Programmer|Wiereyn]]
