Several examples of possible tidal evolution of binary A in CzeV343. Top left panel: orbital (solid lines) and stellar rotation (dashed lines) frequencies for different initial parameters indicated in the legend. Top right panel: ratio between rotation and pseudo-synchronous frequencies including a zoom-in on the early part of the evolution. The vertical dashed line shows the 1% excess possibly detected in CzeV343. Bottom left panel: evolution of λ that converges near the current estimate of 0.005 marked with horizontal dashed line. Bottom right panel: evolution of eccentricity with the value 0.1 marked with a horizontal dashed line. Time is measured in the units of the tidal friction timescale, which is approximately 9 t_circ (Eggleton 2006).