You can also try this, do a Google search on "Chess on Stamps" and then select an image search. Next do an image search on "Chest on stamps" and you will see two different topics, Chest (box) and Chest, things worn on the upper front part of a human. Then when you look closer you may find jewelry shown which came from a famous chest (box) of valuables.
Below are three stamps I collect as a topical. They could be for any of these topicals some of which are not obvious:
Olympic rings on stamps
The Rose Parade
The S/S with the additional stamps open up more topics due to the other stamp images, e.g. The Olympic Torch.
First is a used single either sheet or S/S-
Mint sheet stamp, corner-
I collect them for my topic of Judo which the ATA lists in the group topical of Martial Arts and Judo. Judo is not a martial art.
Why? The building shown was specifically built for the 1964 Olympic Judo and Judo only competition.
Now to the topics listed above:
Kano Jigoro Founder of Judo
Olympic rings on stamps
Olympic Venues Judo
US Senators Friend US Senator Ben Nighthorse Campbell competed for the US team
Native Americans Ben again
The Rose Parade Ben 1992 Grand Marshall
Antonius Geesink Won Gold on the Open Division, one of the two divisions in which I spent my Judo competition career.
Keiko Fukuda, friend, instructor, naturalized US Citizen, last living student of Kano, highest ranking woman judoka in the world at the time of her death in 2013, 61 days short of her 100th birthday, who at the request of the Emperor of Japan performed Ju-No-Kata at the opening ceremony October 3, 1964 for the Nippon Budokan at the start of the Judo competition.
The Beatles, after the Olympics the Nippon Budokan was used for entertainment activities with The Beatles being the first Rock Band to perform there July 30, 1966.
Muhammad Ali, appeared there in 1976 for a "special rules fight" well.
MMA (Mixed Martial Arts) The above contest is considered the forerunner to all subsequent Mixed Martial Arts contests and organizations.
The building was built by a company founded in 1610, remained family controlled until 2013 when the first non-family descendant was appointed president of the company and be part of a topical of the building the company built which appear on stamps.
It would be included in this topic http://goscf.com/t/49455
buildings on stamps which have a Wikipedia entry.
In short, one stamp's possible topical inclusion is only limited by imagination and an understanding of connection to a topic.
Senator Campbell is on the right.