ZMF-II Digital Chess Clock - Red LED Display / Black Case - Chess Clock - Board Game - 2 Players - Adult

I really like this chess clock's old-school LED display and appearance. The design is sleek and pleasing to look at. Cosmetically it was excellent, although the touch plate surfaces were scratched some, probably from the parts being stored unprotected in a tub or box prior to assembly. No big deal.The manual reveals a new feature in the latest firmware that is not covered. That is, the ability to set the increment mode in either "Fischer" or "Bronstein" mode.The Fischer mode adds a fixed increment at the beginning of a turn when the opponent completes his move. The clock immediately shows the total of current time plus increment and counts down immediately from that point. This all seems to work correctly.The Bronstein increment differs from the Fischer increment in that the time is added to the clock at the end of a player's move when he presses his button. In addition, the Bronstein method only increments the amount of time that was actually used to make a move, up to the a maximum of the set increment. If a player has a 10-second Bronstein increment set and takes only 3 seconds to move, only 3 seconds should be added back as an increment. This actually functionally identical to a simple delay, except for the display of time and when the time gets added.The ZMF-II with the latest firmware does not work this way. In Bronstein increment mode, it always adds the full amount of the increment at the end of the player's move, regardless of how long the player took to move. This seems to me to be incorrect and a significant bug with this new feature.I contacted the company and the president himself responded within the hour. The clock is working correctly, but the terminology in the display is incorrect. The real "Bronstein" algorithm is not supported at all. What this new setting does is set when the increment in Fischer mode is added, either when the other player starts your clock ("Pre-Fischer Mode"), or after you complete your move ("Post-Fischer Mode", incorrectly called "bRON" in the display).The Bronstein mode is actually functionally identical to the normal delay mode, except for the way time is displayed and when the time is added to the clock, so no real functionality is lost.It's complicated to wrap your head around, but important to folks wanting to use this clock for tournament play!

Easy to use - bright light

I mostly use this clock for playing speed chess and it works perfectly for that. It's made from a relatively sturdy plastic material that doesn't have much weight to it. However, with the addition of the C batteries (which weren't included) they make it feel heavy. The only things to gripe about are the brightness of the LED's which are hard to read outside in the sunlight and the sound it's supposed to make after someone taps the sensor. The noise is barely audible in a dead silent room which is kind of annoying. Minor complaints aside it's a great product with lots of functionality overall!

great working

Exactly what I wanted. Will definitely do business with again.

Giving only 1 star because I cannot give 0. Very disappointed in the product. It did not even start...tried with multiple set of C batteries but no response.....not even a flicker.Thankfully Amazon has a return policy so returning it. But it is an absolute waste of time ...given the fact that it is a simple digital clock and one should not be spending this time with it. DO NOT BUY.

Good clock for chess tournament.

It didn't work and did not look legit. I asked for a replacement and that didn't work either.