ðə ɹˈuːl ʌv θˈʌm ɪz tə bˈɪd wˈʌn tɹˈɪk fɔːɹ ˈɛvɹi twˈɛlv ɔːɹ ɪlˈɛvən, ænd wˈʌn tɹˈɪk fɔːɹ ˈɛvɹi tˈuː tˈɛnz ænd nˈaɪnz ɪn wˈʌnz hˈænd.
The rule of thumb is to bid one trick for every 12 or 11, and one trick for every two tens and nines in one's hand.