The Pro version of Chess Openings Explorer, with a 3x larger move database, no advertisements, and a built-in chess engine. Step through over 1,000,000 chess opening positions, annotated by name and variation! Each position shows win percentage statistics and most popular variations. The new engine analysis mode allows you to play any opening against the computer.

Position statistics collected from over 1.9 million recent, high-level games.

******************** Testimonials ********************

"Brilliant - *****

Thank you for putting together a BEAUTIFUL opening app. I can't image anything better." -- by FraudAlert

"Excellent...NONE BETTER - *****

I love this app! It's fast, beautiful, and comprehensive. Makes it very easy to practice and learn all the most common (and rare) openings. The author is active on improvements, and takes user recommendations to heart. HIGHLY RECOMMENDED!!!" -- by ECHOOooo

"Great opening tool - *****

There are very few apps that I will take the time to review. However, this is one app that I use every day. It sharpens my opening knowledge Nd would be worth far more than the price at which I purchased it. Kudos."

"Awesome - *****

Easy to use. Easy to follow. Great for those indisposed multitasking opportunities... Strong work fellas!"

What’s New

Version 4.1.1

Fixed a crash in "Play against the Computer" quiz mode.

Ratings and Reviews

4.6 out of 5
125 Ratings
125 Ratings
Cubigami ,

Excellent tool for chess learning

I use this app all the time and it delivers what it promises. If you are serious about chess, you will get your money’s worth in the paid version.

One thing that would make for a better user experience would be some sort of buttons or gesture controls to parse through moves. (The SmallFish iOS app does this well—perhaps something similar to their setup would be doable.) It’s a little annoying to have to tap the tiny moves in the annotation bar under the board to advance through a line.

My only real complaint is that positions that are reached with multiple move orders do not always show the same results. I recently noticed this while looking through a Sicilian line: if you enter 1.e4 c5 2.Nf3 Nc6 3.d4 Nxd4 4.Nxd4 cxd4 5.Qxd4, there is no data for the position, whereas the more common 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nxd4 5.Qxd4, with the pawn taking first and the knight taking second, displays several suggestions from the app’s database even though they transpose to the same position. I’m not sure if this is an intended feature, but it would be most helpful if this were not the case. It makes me wonder what other results aren’t showing up in positions that are commonly reached through several different move orders.

Free-thinker ,

I hope you still intend to upgrade the design…

This is a very good app for learning chess openings. There is a very wide selection of variations also.

Mr. Ashmore, Kudos for your passion, love for chess AND for making this app. I’ve been very critical of this app in the past, but now you’ve made it a VERY GOOD preliminary openings book app, and a very good-looking one, too. I just didn’t want to be harsh critic, and then never come back to praise you when you did finally do well. I know my time away must have made you think I was only interested criticizing you. Being that there hasn’t, been an update since January Twenty-16, and since the chess tournament world is a world that requires updates to moves in a particular place in particular lines, I can’t imagine the chess world is completely satisfied with this app, but I realize that you, alone, can’t possibly keep the latest analyses of all the popular openings up to date, and do it constantly at that.
Nevertheless, considering the way I’ve seen chess players go crazy in openings analyses over many years, this app should be on every player’s iPhone & iPad.
I thank you on behalf of the tournament chess players of the world..

aranpura ,

Exactly what I wanted

I was looking for a database of openings that I could easily study in spare moments. I have some books which talk about opening theory and variations, these are interesting but I am not yet at that level. The most useful things I have found are videos from the Saint Louis Chess Club and this app. Quiz mode is fabulous, and you can quickly flip from the quiz to full openings. The only criticism I have is that the search function is not robust (if I type "queen Indian" it will not find "Queen's Indian"). But it's still easily worth the price!


Thomas Ashmore
162.7 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2010-2017 Tom Ashmore


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