the nice point is that i tried mustrum on it, and it made a mistake later, so i won it finally

Yes most programs are terribly slow with non-standard positions. And if you don't let them finish thinking, they'll often make an error. Before I had vianiato, i would test moves like that on mustrum and titot, and i think mustrum took 15 minutes to solve that problem for G1. Vianiato gets it in like 10 seconds, lol.

I wonder if you have any objections to me answering by editing your posts

Not at all, feel free. As long as u don't change my words to say things like "i like to drink cow saliva", it's fine

[How about "I like to eat bread with wasabi on it"? Hell, I don't feel better after that - Teach. My first idea was F3, but after a while I've decided D2 would be better. Nothing more than a draw.

This was probably the hardest one. Believe it or not, this is a "standard" position (though hardly ever seen in a regular game); Red made no errors, so Red can win. Red wins with B2. In my prime i'd be able to explain why, but now i don't know exactly why it's B2, except that Vianiato says so lol. I suppose Red has a combination of a potential horizontal and a diagonal. If Black responds F3, i'm guessing Red can go C3. If Black responds C3 instead of F3, it looks to me like Red could go F3 then C4.

The next two you got right, nice. You forgot to answer the last one though, heh. Now for yours:

Task 7: A1 to prevent yellow from getting a diagonal below his horizontal which would make a double attack.

Task 8: Looks like D6 to block the top row.

Task 9: very nice problem!!!

First note that B1 was not an error. After White's E1, Black can get a draw with E2, D1, C1 or B1, all 4 choices are equally good. 4)-F2 was an error, and so was 5)A1, not that it matters. This problem is so great because it's so similar to another difficult position except the colors are completely reversed! It's not uncommon for White to be in the position Yellow is in, and for Black to be in the position Red is in. I had to think hard for this, but i arrived at F3 because I knew he had to threaten an odd attack on the right side otherwise easy win for White on the left side. It looked like Black's possible diagonal from B5 to E2 cancelled out White's possible open-ended horizontal from D5 to F5. I was so curious i had to check my answer, and F3 is right. But i was surprised later on when I continued the game. After 7)-F3 I made White play 8:F4, then Black 8:C1. I thought White could respond with either 9)B5 or 9)F5 to get a draw, but Vianiato says 9)D6 is the only draw move. What i hadn't noticed before was that Black gets a diagonal from D1 to F3 if not for 9)D6, Black would win on F4 with the diagonal.

Okay here's 1 problem that I took from James Allen's tutorial

Expert Play in Connect Four, which is no longer on the internet. Fortunately I had posted this problem on a forum before so I still have it. It's known simply as "Problem E".

Difficulty: Very Hard

1) D1 - E1

2) A1 - C1

3) E2 - E3

4) C2 - C3

5) C4- D2

6) D3 - F1

7) E4 - B1

Red to move. Does Black win? If not, where must Red play, and what is the result?