This series by Kostrov and Beliavsky is also available on Scribd in multiple volumes, including Volume 2 and Volume 3 .
A 524-page follow-up with 404 challenges for players looking to seriously improve can be found on Scribd .
You can find several volumes of chess tactics exercises available for digital viewing or download through online archives and educational platforms.
A preview of the first volume including tactical hints for various positions is available at De Beste Zet .
This volume contains 1,343 exercises grouped by combinational methods and is hosted on the Internet Archive .
