Hartley's defensive system was to protect the 'rink within the rink' aka the middle of the ice. When defending the rush his D would allow entry if it came down the wings, they stayed inside the circles.
Hartley allowed teams to gain the blue line and he relied on shot blocking by defending inside the dots. He also had his forwards track back hard and collapse in.
Gulutzan wants his D to shift over to oncoming rushers and he tries to kill plays early at the blue line. Gulutzan details the difference quite well in this video:
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