Quoted from BrianBannon:I have two of the Fidelity Phantom computers, one normal and one eyeball, they are identical to the Milton Bradley design with a stronger playing program. You would be better served by NOT buying these to play on. They do work and are cool for a time, but the unit is big, the pieces are small, it is noisy, and does break. Don't forget, it is 1980s technology and parts are hard to find. The pieces are specially designed for these units, so if you lose one you just can't grab another piece and have it work. I just looked on ebay and a Phantom sold recently for $52, why so cheap? No pieces. I have fixed both of mine a couple of times over the years. It is really more of a conversation piece than a good playing partner.
I don't own a Square Off if only because most of the robotic designs built into chess computers have not held up well over time. Novag tried it a couple of times with the Novag 2 Robot and Robot Adversary, both with robot arms-bad idea. Finding one of those still working is like finding a NIB Addams Family, it just doesn't happen anymore. Excalibur tried it with the Mirage and it is just a cheaper Phantom made in China with plenty of issues. Phantom probably is the best of the bunch and it is not trouble free by a long shot. Time will tell on the Square Off, ask the owners in a few years to find out how it has held up. It looks really cool, no doubt.
Here are a few cheap suggestions that will get your feet wet without breaking the bank, all used and available on ebay:
Fidelity Excellence--cheap and strong enough for most players, around $50
Fidelity Designer Series--cheap and reliable, $50-100
Radio Shack has a number of models that would work fine and unless you are over 1500 USCF they have lots of strength for you-$25 and up
Novag--any of the Constellation models, plus the Emerald, Zircon, Aquamarine, more expensive but worth it.
Buy a cheap chess computer and see how you like it. Then buy another one if you like it a lot, just like pinball machines only they are cheaper and don't take up as much space.
I got this Saitek Kasparov model for $30.00 shipped. I went with this type since it has the little red lights that indicate which piece is to move and to where it is supposed to move. These little light seem more solid than one with an LED display.
I imagine whatever software is powering it will be good enough to kick me all over the board.
Still, those boards with the self-moving pieces do look tempting.
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What I noticed when shopping Ebay is how many vintage electronic chess boards were for sale that did not have any pieces, or had missing pieces. A few sellers placed some cleverly worded ads in an attempt to hide the fact that there were missing pieces with what they were selling. The pieces are special and cannot be replaced with any old piece.