Chess tempo tactics not working on kindle fire

Tempo, a fundamental concept in chess

Games - PT Chess

ChessTempo

Is there a puzzle/tactics site for backgammon like chess tempo? : r/backgammon

Tactics from the Old Masters - Chess Lessons

Chesstempo died with beta..sad - Chess Forums

Chesstempo' s exercises - Chess Forums

Does anyone else's chesstempo graph show no improvement? : r/chess

chess.comとchesstempo.comでTactics

Tactics Time! 1001 Chess Tactics from the Games of