1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911
1901 34 supply centres
1902 31–34 supply centres
1903 28–38 supply centres
1904 27–35 supply centres
1905 26–35 supply centres
1906 19–34 supply centres
1907 13–29 supply centres
1908 7–21 supply centres
1909 2–13 supply centres
1910 2–7 supply centres
1911 2 supply centres
Wall of Ice is a Diplomacy variant created by David E. Cohen. Ice spreads from the north, making the seas impassable and destroying supply centres. By 1911 there are only two supply centres left. The occupant (if any) of these supply centres in winter 1911 is the winner; or if they have occupants from different nations, these nations share a two-way draw.
A sea area shown as 
is impassible with probability ¼.
A sea area shown as 
is impassible if it was impassible last year;
otherwise it is impassible with probability ¾.
A supply centre shown as 
exists with probability ¾.
A supply centre shown as 
is not there if it was not there last year;
otherwise it is there with probability ¼.
A supply centre shown as 
exists with probability ¼.
A supply centre shown as 
is there if it was there last year;
otherwise it is there with probability ¾.
Related Diplomacy variants are Sahara and Deluge II.
Wall of Ice is a Diplomacy variant created by David E. Cohen. These maps were created by Nick Wedd, based on an original Standard map drawn by Chris Adams.