Problems of kvzrock (18)

12438 life and death 10771 life and death 10698 endgame 10683 life and death 10681 life and death 6724 life and death 6613 life and death 6611 life and death 6565 life and death 6554 life and death 6532 life and death 6529 tesuji 6528 life and death 6518 life and death 6515 tesuji 6512 tesuji 6418 elementary 6417 endgame