In the DOS version of Street Fighter II it's usually not possible in the two player v.s. mode for both players to select the same character. But this game has a cheat code that enables this hidden feature:
Press P to pause the game. While holding down Ctrl type in "3months". If you've done this right the KO image will flash and the music on the title screen is different.
It's now possible for both players to select the same character. To distinguish both characters the colors of the second character are different.

This video shows all the different characters and their special moves.
00:52 Ryu v.s. Ryu
02:09 E Honda v.s. E Honda
03:02 Blanka v.s. Blanka
04:06 Guile v.s. Guile
04:58 Dhalsim v.s. Dhalsim
06:48 Dhalsim v.s. Dhalsim
08:06 Zangief v.s. Zangief
09:02 Chun Li v.s. Chun Li
10:01 Ken v.s. Ken
I couldn't perform Dhalsim's Yoga flame in the first match, so I recorded another one.

As a bonus, at the end of the video it shows a way to quickly quit this game: Press P to pause the game and press Alt + X.

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