Should Transgendered women be allowed to compete against biological female athletes

The following is only my opinion. I think that making a transgender fight a biological woman athlete entails unfairness towards the game. Biologically, even with the said estrogen levels contained by the transgender, there is still a difference in strength compared to a real woman. I'm not belittling women fighters, but there are some aspects in them that they may not meet with a transgender. Remember, a transgender is once a male. Let alone his sex organs were removed, and hormone levels were altered, but the man inside the transgender will still be there.