The ruling on one who prayed in the open desert and did not make an effort to determine the qiblah

Question:
If a person prays in the open desert and does not make an effort to determine the qiblah, but rather begins the takbir as soon as he arrives?

Answer:
If he did not make an effort, he must repeat the prayer.
Q: But what if he happened to face the qiblah without making an effort?
The Shaykh: If he happened to face the qiblah, praise be to Allah.
Q: Even if he did not make an effort?
The Shaykh: Even if he did not make an effort, as long as he prayed believing that it was the qiblah, praise be to Allah. This is what is required.
Q: No, he prayed carelessly. He was told to look for it, and he said it was not necessary?
The Shaykh: As long as he prayed believing that it was the qiblah, praise be to Allah.