As good as if not better than almost everything out there regardless of platform. I use this to analyze all of my games whether OTB or online. I love that it shows multiple lines with each move. Trust me when I say that it's hard to find anything as robust and user-friendly on PC (eg, Lucas Chess can run Stockfish but I haven't been able to configure the settings to display multiple lines during analysis). And hats off for an exceptional (and appropriate) privacy policy! This app is a gem and must-have for chess enthusiasts of every level. Not convinced by my endorsement? SmallFish is recommended by the Stockfish team via the official website. -14 Pro Max on iOS 16.1.x

This thing is simply amazing! A must-have for any serious or aspiring Chess player. It used to be, in my experience, that a phone app couldn't match up to a program on a computer. I have this app on my lap(tablet)top and on my phone and it performs just the same. Extremely strong! You can see several lines simultaneously. Truest a great study/strengthening tool. The fact that it's free, well, it's just outstanding...!

This chess game provides a list of customization features, which I love. One problem, sometimes, it won’t let me move my pieces. Right when the opposing opponent is done, I try to move a piece, but it wouldn’t let me. I could only move my king, making me watch all of my other pieces soon disappear and leave my king all alone. One time, it froze completely and left me just staring at my screen for a good twenty seconds. At least it provides opportunities for settings for newer players, such as showing legal moves and difficulty modes.

No matter what I do in the options, I always win because my opponent runs out of time. The game continues, however, even though the clock is 0.00 so that’s a good thing. This issue starts immediately: playing white pieces, I play 1. d4, black always immediately plays either d5 or f6; I play 2. c4 . . . . black “thinks” 20-40 seconds before making a second move, usually c5. Really? As long as 40 seconds to make the second move. And that “thinking” exists throughout the game. For instance, black offers a queen trade: I accept. Then black deliberates 20, 30, etc. seconds whether or not to capture my queen when there is obvious nothing to deliberate. Hardly a realistic or enjoyable scenario.