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DD151
Platform Techchasing
I looked at two methods of covering all tech options on platforms without reading or reacting. These are Double Jump Land > Dsmash and Full Jump Fair > Turnaround Ftilt/Dsmash.
Because Dream Land has the longest platforms, I chose to use them for the test. Dsmash and Fair > Dsmash, if spaced properly, will cover the entire platform on Dream Land or any other stage.
DJL > Dsmash on Dream Land platform:
1 Full Jump
23 Double Jump
24 Wait
25 Dsmash
30 Hitbox
45 Second Hitbox
Window for covering all options with Dsmash: 6 frames
By timing the Dsmash so that the first hit comes out on frames 20-25 of the opponent's tech option, and spacing it so that Yoshi is in the middle of the platform and facing the opponent, you can cover missed tech, tech in place and techroll away with the first hit, and techroll behind with the second hit.
In this example, all options are covered:
Frame 64 of the GIF is shown here:
The downside to this, of course is that you usually don't want to Dsmash your opponent to the middle of the stage.
Full Jump Fair > Dsmash on Dream Land platform:
1 Full Jump
18 Fair
34 Fastfall
36 Hitbox
37 Land
47 Turnaround
48 Ftilt/Dsmash
53 Hitbox
Window for covering all options with Fair > turnaround Dsmash/Ftilt: 3 frames
By timing the Fair so that its hitbox comes out on frame 21 of your opponent's tech option, and spacing it so that the Fair covers one half of the platform, you can cover missed tech, tech in place and techroll to that side of the platform with the Fair, and then turn around and cover the other techroll with either Dsmash (for the outer side of the platform at higher %) or Ftilt (for either side of the platform at lower %).
Here is an example of the Fair covering tech in place:
Note that you do not necessarily need to space the Fair in the middle of the platform if the opponent techs in the middle. Covering either half of the platform will also cover the middle.
Here is an example of the same Fair covering tech in place, while the Ftilt covers techroll behind:
There are some complications when platform techchasing like this. If you are at centre stage and the opponent is sent towards one of the side platforms, and they tech on the inner (or closer) half of the platform, it is difficult to cover all tech options. This is because you must turn around and jump backwards to cover the inner half of the platform with either Fair or the first hit of Dsmash. It is possible to do, but adds an extra technical requirement. Something simpler like Full Jump Nair > Dashgrab or maybe Dsmash would be useful if jumping backwards onto the platform with Fair does not seem reasonable to you.
To set up these platform techchases, you need to force the opponent to tech on the platform and have enough time to get your hitboxes out on the right frames. I looked at 8 possible setups for these platform techchases. The numbers are for Falco on Dream Land, but the information should be applicable to other characters and other stages as well (with the spacing being easier on other stages). All setups are from the ground, and the frame count starts with the frame on which the opponent is hit, and includes hitlag.
This isn't to say that you can't techchase after Dthrow and Uthrow, just that you won't be able to do the guaranteed option coverage setups from throws (except no DI Dthrow at high %).
Late edit: Ftilt (80 degree hitbox) | No DI | 48%-107% | 23-69 | 31 | 69%-107% | 83%-107%
Later edit: From 70-127%, you can combo Ftilt into Fair. This lets you force a tech on the platform past 107%.