80-Bus News

  

September-October 1983, Volume 2, Issue 5











Page 48 of 67











"nei eC A gE BES,

48

Free Program! (Couldn’t get anyone to buy it!)

This program prints out a brief (very!) explanation of each of the error messages given out by the Hisoft Pascal 4 compiler. It is run from CP/M by typing the word "explain", followed by a space, then the error number, and then "enter". This saves one the bother of getting the manual out and turning to page 35, which is where I have copied all the text from, so the program probably belongs to Hisoft at least as much as it does to me! I did actually try to sell it to Hisoft, then I tried to give it to them, in the hope that they would send it out with all their compilers, but they were not putting up with such amateurish efforts, or something like that...

Dreadful Chess Tournament Ends in Exhaustion.

A friend of mine has been improving Sargon for some time now, and recently sent me a tape of his latest version. As it uses good old Nas-Sys in the approved manner, it works fine with MONITOR.COM, as you would expect. I beat it on level three, and decided to play it against my Spectrum, which I loaded with Quicksilva’s program "The Chess Player". (Silly Scenario number 42, an alien android has arrived and will destroy Earth unless you can beat it at Chess! Presumably this is a sop to the space invader fans.) The resulting game was very enlightening. It was also very exhausting, as Marvin is upstairs, while the Spectrum is downstairs. This exercise factor was one reason why the game did not get finished. The main reason, however, was that the Spectrum was so dreadfully slow that in a tournament it would have run out of time. Marvin, running the improved Sargon, produced a move within two minutes, at all times. When in check, the response was much faster, under ten seconds.

The Spectrum played with the white pieces, while Marvin was black.

1 e2 ef e7 5 10 ef dl g8 £6 19 b2 b3 £6 £5 2 bi 3 b8 c6 11. £7 h8 eT e5 20 hi eg! b7 b6 3 gi £3 a7 a6 12 d5 e6 chk a7 e6 21 h2 h3 gz4 d4 4 d2 a4 e8 g4 13 ct 25 £8 e7 22 di a4 ch d4 5 d4 a5 c6 e5 14 e4 d6 e5 23 c3 bS a7 a5 6 £3 e5? ge dl 15 dl e2 a8 h8 24 gi dl eT b4 7 £1 bS chk d8 a7 16 95 f6 e7 f6 25 £2 £4 b4 5 8 »b5 a7 chk e8 d8 17 al di h8 g8 26 Dr Dark to bed... 9 e5 f7 chk d8 a7 18 g2 23 g8 g4

If you play it through, you will probably reach the same conclusions that I did. The Spectrum program is very heavily biased towards moves that put its opponent in check, and almost always takes when offered an exchange. The final position would almost certainly lead to a draw, with just the Kings left. At least Sargon’s habit of throwing its Queen away in four moves has been fixed, but neither program seems to have much idea of how to put the other in check mate – there are several points in the game where good moves were ignored, in favour of material gain.

Why have I bought a Spectrum?

Not just to play chess against Marvin, I can assure you. And not to use as a colour display board either, for that matter! No, it is far more devious than that, I can assure you! Some months ago, when I first heard about Micronet 800, I decided that Marvin just had to be connected. I phoned the local British Telecom sales department, who had never heard of Prestel, and eventually managed to get the number of the Micronet people. The man I spoke to was very interested to hear about Marvin, but was also very firm – there


This is an OCR’d version of the scanned page and likely contains recognition errors.











Page 48 of 67