Neither one has a fully symmetric clue layout, but I’m happy with them as they are.
Regular Masyu rules.
The full title of this one is Alternating Liars Masyu. In addition to regular Masyu rules, half the clues are liars: that is, a liar white pearl acts like a black pearl, and vice versa. The loop must alternate between truthful and liar pearls: going around the loop, every other pearl must be a liar.
While using guesswork might be tempting, there is a particular insight this puzzle was built around.