Based on the above formula, the sweet spot for Soviet surrender is 30-40 units left in play with a NM of 40 or less. Should give you an approximate 50% chance of surrender every turn

<r> Historically, the German transportation network throughout the majority of the war was reliant on horses (up to 80% capacity in some instances) as the primary mode of moving men and materials throughout the Reich, becoming more common as one traveled closer to the front. The cost of mobility ...