SAFE CHESS (another sample game)

Standard progressive, but mate may not be given except against a bared king.

Game sample:
. . . . . . . .  |  1. Nf3
. . . . p . . .  |  2. f5 Nf6
. . b k . p . .  |  3. N,:d8
. . . . . . . .  |  4. f4f3:e2:d1Q+
p . . . . . . .  |  5. K:d1 Ne6:f8:d7:f6+  
. . . . . . . .  |  6. g:f6 Rg8:g2:h2:h1:f1+
. . O . . O . .  |  7. Ke2:f1 a456:b:c8Q+
. . K . . . . .  |  8. Kf7 Nc6 R:c8b8:b2:b1:a1:c1+
                    9. Ke2 d456:c78Q:c6 Kd2:c1
                   10. h5h4h3h2h1B:c6 Ke6d6 a5a4