Playing in a suit contract

Whether to draw trumps, or ruff.
This video has some problems where very few participants found the right answers.
Can you do better?
You can replay the hands using the following links:
Draw trumps unless there is a reason not to: tinyurl.com/yywzd9wv tinyurl.com/23wrxvn6
tinyurl.com/y3mqm4m5
tinyurl.com/yaegsxp4 If you can ruff 2 hearts you will make 12 tricks. Do not be tempted to ruff a diamond in your hand. It will not lead to any extra tricks and can lead to you losing control of trumps, if there is an unfavourable trump division. tinyurl.com/y9lxvyhz - only making 10 tricks, as you lost trump control.
tinyurl.com/y97olbyo You reach a contract of 4S.
If you try to crossruff you may make only 11 tricks tinyurl.com/29zywvyu

[@armantookmanian1938]

The hand discussed at 27 minute mark was very instructive. Making 13 tricks was possible with normal suit breaks, and although it might only make 12 or 11 with other layouts (e.g. E holding 4 trump, or W a Diamond doubleton, or even a 0-5 Club split), there is no downside to playing the line you showed as best. I wonder how many times I've received a poor matchpoint score by simply crossruffing and settling for a 4S+1 result, not stopping to think "there might be a better way." Thank you!

[@Nbroughton100]

Hi Tony, another great tutorial. Many thanks.
At 24.00 things work out well as the opponent's trumps split 3-2. Is there a strategy which guards against them splitting 4-1 (28% chance, but seems to happen a lot more than that with me!).
Thanks for your comments, Nigel

[@paulbernadini431]

Thanks!

[@TonyStawBridgeClass]

Many thanks, Paul. Very kind of you!