- The first move forces black off the e-line because of fe4 followed by ge6 or vice versa, or on e97 (e98) immediately g67 (g68) .
- The second move prevents de9 because of ge3 followed by fe5.
- d98 and d97 are followed by g38 and g37 respectively.
- d92 is followed by 3.gd3-de2, 4.fe5-e24x, 5.de3
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