Basically - you must deliver scenario in which one or more country get better tanks during WW2 without supernatural help.
My scenario:
In 1935 french intel warn their goverment,that germans plan to build medium tanks with long 75mm gun and heavy tank with 88mm gun.That was not true,but french belived,and poured their money into medium Char 1G tank with long 75mm gun,rangerinder and slopped armour.
And heavy,let say Char 2,with 90mm.
Germans,italians and soviet discovered this,and ,from 1936 work on:
1.Germans - Pz IV with 75/43 gun,Pz VI with 88/56 gun,and Stug III with 75/43 gun
2.Italians - P.40 with 75/34 gun,Semovente with 75/34,100/25 and 75/46.
3.Soviets - T.43 and KW3 tanks.
Japan start working on Type 3 tank
England - Valentine and Crusader tanks with 57mm guns.
1939 - we have germans with Pz IV 75/43,czech medium tanks with 47mm guns,STIII.Poland fall on schedule.
1940 - France have 300-400 new Char 1G tanks with 75/46 guns and prototypes of heavies with 90mm.Fall on schedule,too.
Germans start mass producing both in France for their army,Italy made some Char 1G for themselves,too.
Germans start working on PZ V
1941 - in Africa Italians hold more territory with Semoventes and few P.40 tanks.
Soviets use T.43,Kw3, germans - PzIV with 75/48 and Pz VI,french Char 1 and 2,czech medium tanks.Results - like in OTL.
1942 - Japan use Type 3 medium tank,had Type 4 prototype.Germans use Pz VA.Soviets IS1.Americans - M3 and M4 with 76mm gun.
British use Churchill and Cromwell.Italians - Semovente 75/46.
1943 - Germans use Pz.V D,first Pz VIB.
soviets T.43.85 and IS2,Italy P.43 and Semovente with 90mm gun.
1944 - Japan use Type 4 tank,Germans Pz.V F and modified PzVIB/good engine/,americans M.26,british Centurion,soviets T.44 and IS3
1945 - germans before fall use Panther II or E.50,and some E.75.soviets IS 4 ,americans M.48,british Centurions with 83mm guns.
How would it change tanks after WW2? i think,that when soviet fall,we would have NATO tanks with 140mm guns,and soviets with 152mm guns.
Fell free to deliver your own scenarios.
My scenario:
In 1935 french intel warn their goverment,that germans plan to build medium tanks with long 75mm gun and heavy tank with 88mm gun.That was not true,but french belived,and poured their money into medium Char 1G tank with long 75mm gun,rangerinder and slopped armour.
And heavy,let say Char 2,with 90mm.
Germans,italians and soviet discovered this,and ,from 1936 work on:
1.Germans - Pz IV with 75/43 gun,Pz VI with 88/56 gun,and Stug III with 75/43 gun
2.Italians - P.40 with 75/34 gun,Semovente with 75/34,100/25 and 75/46.
3.Soviets - T.43 and KW3 tanks.
Japan start working on Type 3 tank
England - Valentine and Crusader tanks with 57mm guns.
1939 - we have germans with Pz IV 75/43,czech medium tanks with 47mm guns,STIII.Poland fall on schedule.
1940 - France have 300-400 new Char 1G tanks with 75/46 guns and prototypes of heavies with 90mm.Fall on schedule,too.
Germans start mass producing both in France for their army,Italy made some Char 1G for themselves,too.
Germans start working on PZ V
1941 - in Africa Italians hold more territory with Semoventes and few P.40 tanks.
Soviets use T.43,Kw3, germans - PzIV with 75/48 and Pz VI,french Char 1 and 2,czech medium tanks.Results - like in OTL.
1942 - Japan use Type 3 medium tank,had Type 4 prototype.Germans use Pz VA.Soviets IS1.Americans - M3 and M4 with 76mm gun.
British use Churchill and Cromwell.Italians - Semovente 75/46.
1943 - Germans use Pz.V D,first Pz VIB.
soviets T.43.85 and IS2,Italy P.43 and Semovente with 90mm gun.
1944 - Japan use Type 4 tank,Germans Pz.V F and modified PzVIB/good engine/,americans M.26,british Centurion,soviets T.44 and IS3
1945 - germans before fall use Panther II or E.50,and some E.75.soviets IS 4 ,americans M.48,british Centurions with 83mm guns.
How would it change tanks after WW2? i think,that when soviet fall,we would have NATO tanks with 140mm guns,and soviets with 152mm guns.
Fell free to deliver your own scenarios.