// IID 
   if (!transpositional_movement && deepness >= 6) { 
       itog = below; 
       if (deepness >= 10) { 
 		itog = white_pv (below - deepness, above + deepness, deepness - 8, shah); 
 		if (itog > below - deepness) 
 			transpositional_movement = (tower_structure + 1)->move; 
 	  } 
       if (itog > below - deepness) 
 		itog = white_pv (below - deepness, above + deepness, deepness - 4, shah); 
       if (itog > below - deepness) 
 		transpositional_movement = (tower_structure + 1)->move; 
   } 
   else if (deepness >= 10 && deepness > hash_deepness + 8) { 
       itog = white_pv (below - deepness, above + deepness, deepness - 8, shah); 
       if (itog > below - deepness) 
 		transpositional_movement = (tower_structure + 1)->move; 
       if (itog > below - deepness) { 
 		itog = white_pv (below - deepness, above + deepness, deepness - 4, shah); 
 		if (itog > below - deepness) 
 			transpositional_movement = (tower_structure + 1)->move; 
 	  } 
   } 
 

 
 if (deepness >= 16 && S->transpositional_movement && singular < 2 && white_ok (S->transpositional_movement)) { 
 	  // реальная глубина в 2 раза меньше 
 	  // white_exclustion () - функция ищет все ходы, кроме trans move 
       move = S->transpositional_movement; 
       kk = ((move) & 077); 
       ot = (((move) >> 6) & 077); 
       white_spell (move); // делаем ход 
       evaluation_scoring (-0x7fff0000, 0x7fff0000, move); 
       if (((tower_structure + 1)->white_king_check)) 
 	{ 
 	  white_unspell (move); 
 	  goto zab; 
 	} 
       score = -black_pv (-above, -below, deepness - 10, (((tower_structure + 1)->black_king_check)) != 0); 
       white_unspell (move); // отмена хода назад 
       if (shah) // нам шах 
 	itog = white_exclustion_check (score - deepness / 2, deepness - (((12) <= (deepness / 2)) ? (12) : (deepness / 2)), move & 0x7fff); 
       else 
 	itog = white_exclustion (score - deepness / 2, deepness - (((12) <= (deepness / 2)) ? (12) : (deepness / 2)), move & 0x7fff); 
       if (itog < score - deepness / 2) // все остальные ходы проигрывают нашему ходу из trans 
 	{ 
 	  singular = 1; // т.н. "единственность" (чем больше, тем хуже остальные ходы, как-то так) 
 	  if (shah) 
 	    itog = white_exclustion_check (score - deepness, deepness - (((12) <= (deepness / 2)) ? (12) : (deepness / 2)), move & 0x7fff); 
 	  else 
 	    itog = white_exclustion (score - deepness, deepness - (((12) <= (deepness / 2)) ? (12) : (deepness / 2)), move & 0x7fff); 
 	  if (itog < score - deepness) 
 	    singular = 2; 
 	} 
   } 
 

 
 while ((move = white_next (S))) { 
 ... 
    novel_deepness = deepness - 2 + (((stretches) >= (singular)) ? (stretches) : (singular)); // новая глубина 
    // stretches - обычные extensions 
 ... 
 }