Fischer random chess numbering scheme: Difference between revisions

Revision as of 07:07, 22 February 2023

Revision as of 07:35, 22 February 2023

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For any SP, after ignoring the bishops, attention is given first to the knights (rather than to the queen). After taking account of the arrangement of the two knights in six squares (skipping over bishops), the queen is left with four possibilities: 0,1,2,3 (counting from the a-side of the board and skipping over bishops and knights). The queen's position is the number of hyphens to the left of the "Q" in the NQ-skeleton for the SP.

Given an SP, extract the bishop's code, the NQ-skeleton and its queen's position. Then, locate, in the appropriate column, the NQ-skeleton at hand, say at No. M. The Fritz9 idn = (bishop's code) + M. For the standard SP, we extract 6 -NQ-N-RNQKNR and 1 and get Fritz9 idn = 6 + 353 = 359.

In the table below, the columns correspond to the queen's position, and, in each column, the ordering is alphabetic with "-" last.

Given an SP, extract the bishop's code, the NQ-skeleton and its queen's position. Then, locate, in the appropriate column, the NQ-skeleton at hand, say at No. M. The Fritz9 idn = (bishop's code) + M. For the standard SP, we extract 6 -NQ-N- and 1 and get Fritz9 idn = 6 + 353 = 359.

'''Fritz9 NQ-skeleton Table'''

Line 188 ⟶ 186:

{| class=wikitable

|-

| 1 || NNQ---NNQRKR || 241 || NN-Q--NNRQKR || 481 || NN--Q-NNRKQR || 721 || NN---QNNRKRQ

|-

| 17 || NQN---NQNRKR || 257 || N-NQ--NRNQKR || 497 || N-N-Q-NRNKQR || 737 || N-N--QNRNKRQ

|-

| 33 || NQ-N--NQRNKR || 273 || N-QN--NRQNKR || 513 || N--NQ-NRKNQR || 753 || N--N-QNRKNRQ

|-

| 49 || NQ--N-NQRKNR || 289 || N-Q-N-NRQKNR || 529 || N--QN-NRKQNR || 769 || N---NQNRKRNQ

|-

| 65 || NQ---NNQRKRN || 305 || N-Q--NNRQKRN || 545 || N--Q-NNRKQRN || 785 || N---QNNRKRQN

|-

| 81 || QNN---QNNRKR || 321 || -NNQ--RNNQKR || 561 || -NN-Q-RNNKQR || 801 || -NN--QRNNKRQ

|-

| 97 || QN-N--QNRNKR || 337 || -NQN--RNQNKR || 577 || -N-NQ-RNKNQR || 817 || -N-N-QRNKNRQ

|-

| 113 || QN--N-QNRKNR || 353 || -NQ-N-RNQKNR || 593 || -N-QN-RNKQNR || 833 || -N--NQRNKRNQ

|-

| 129 || QN---NQNRKRN || 369 || -NQ--NRNQKRN || 609 || -N-Q-NRNKQRN || 849 || -N--QNRNKRQN

|-

| 145 || Q-NN--QRNNKR || 385 || -QNN--RQNNKR || 625 || --NNQ-RKNNQR || 865 || --NN-QRKNNRQ

|-

| 161 || Q-N-N-QRNKNR || 401 || -QN-N-RQNKNR || 641 || --NQN-RKNQNR || 881 || --N-NQRKNRNQ

|-

| 177 || Q-N--NQRNKRN || 417 || -QN--NRQNKRN || 657 || --NQ-NRKNQRN || 897 || --N-QNRKNRQN

|-

| 193 || Q--NN-QRKNNR || 433 || -Q-NN-RQKNNR || 673 || --QNN-RKQNNR || 913 || ---NNQRKRNNQ

|-

| 209 || Q--N-NQRKNRN || 449 || -Q-N-NRQKNRN || 689 || --QN-NRKQNRN || 929 || ---NQNRKRNQN

|-

| 225 || Q---NNQRKRNN || 465 || -Q--NNRQKRNN || 705 || --Q-NNRKQRNN || 945 || ---QNNRKRQNN

|}