One evening, after losing the same line of the Sicilian Dragon for the fifth time in two months, she opened her laptop in frustration. “There has to be a way to study like a grandmaster without hiring a team,” she muttered.

Used for local opening books within the HIARCS Chess Explorer (HCE) and HCE Pro applications.

How it’s built

Unlike purely statistical books that simply scrape online databases, HIARCS 15q is hand-tuned and curated. Mark Uniacke and his team combine the latest grandmaster (GM) tournament practice with billions of positions evaluated by the world's strongest chess engines. This eliminates "novelty traps"—moves that look good statistically in rapid online games but fail under strict classical scrutiny. 2. Massive Size and Depth

Load your played games into ChessBase (using the CTG book) or HIARCS Chess Explorer (using HCS) and compare your openings to the 15q suggestions.

: The CTG layout displays comprehensive branching trees detailing win-loss ratios, performance ratings, and exact variations built from top-tier human and machine games.

Formats and compatibility

Because the package includes CTG and BIN formats , it is the only opening book you will ever need for your PC, Mac (via Wine/CrossOver), or Android device.

The inclusion of the CTG format is a major selling point.

Her opponent, expecting a classical Italian, walked right into it. By move 12, he was down a pawn and under pressure. He resigned on move 28.

The native format used directly by the HIARCS engine in various environments. Many users consider this format superior for engine-to-engine matches because it supports specific "learning" features where the engine can record its own results. Content and Performance