Golf ball

A golf ball comprising a core, a mid layer positioned outside the core, and a cover positioned outside the mid layer, wherein

• a ratio R1 calculated by the following mathematical formula (1) is not less than 5.00,
• a ratio R2 calculated by the following mathematical formula (2) is not less than 2.00,
• a ratio R3 calculated by the following mathematical formula (3) is not less than 50,
• R1=(Df1−Df2)/(Df2−Df3) (1),
• R2=(T2*H2)/H3 (2),
• R3=D1/T3 (3),
• wherein
• Df1 represents an amount of compressive deformation (mm) of the core,
• Df1 represents an amount of compressive deformation (mm) of a sphere including the core and the mid layer,
• Df3 represents an amount of compressive deformation (mm) of the golf ball,
• T2 represents a thickness (mm) of the mid layer,
• H2 represents a hardness (Shore-D) of the mid layer,
• H3 represents a hardness (Shore-D) of the cover,
• D1 represents a diameter (mm) of the core,
• T3 represents a thickness (mm) of the cover,
• Df1, Df2, and Df3 are measured according to a compression test including application of an initial load of 98 N and a final load of 1274 N,
• the amount of compressive deformation Df1 of the core is not less than 3.80 mm,
• the amount of compressive deformation Df2 of the sphere including the core and the mid layer is not less than 3.30 mm,
• the amount of compressive deformation Df3 of the golf ball is not less than 3.07 mm,
• a difference (Df1−Df2) between the amount of compressive deformation Df1 and the amount of compressive deformation Df2 is not less than 0.40 mm, and
• a difference (Df2−Df3) between the amount of compressive deformation Df2 and the amount of compressive deformation Df3 is not greater than 0.12 mm.

A golf ball comprising a core, a mid layer positioned outside the core, and a cover positioned outside the mid layer, wherein

• a ratio R1 calculated by the following mathematical formula (1) is not less than 5.00 and not greater than 40.00,
• a ratio R2 calculated by the following mathematical formula (2) is not less than 2.00 and not greater than 3.50,
• a ratio R3 calculated by the following mathematical formula (3) is not less than 50 and not greater than 150,
• R1=(Df1−Df2)/(Df2−Df3) (1),
• R2=(T2*H2)/H3 (2),
• R3=D1/T3 (3),
• wherein
• Df1 represents an amount of compressive deformation (mm) of the core,
• Df2 represents an amount of compressive deformation (mm) of a sphere including the core and the mid layer,
• Df3 represents an amount of compressive deformation (mm) of the golf ball,
• T2 represents a thickness (mm) of the mid layer,
• H2 represents a hardness (Shore-D) of the mid layer,
• H3 represents a hardness (Shore-D) of the cover,
• D1 represents a diameter (mm) of the core,
• T3 represents a thickness (mm) of the cover,
• Df1, Df2, and Df3 are measured according to a compression test including application of an initial load of 98 N and a final load of 1274 N,
• the amount of compressive deformation Df1 of the core is not less than 3.80 mm and not greater than 4.50 mm,
• the amount of compressive deformation Df2 of the sphere including the core and the mid layer is not less than 3.30 mm and not greater than 4.00 mm,
• the amount of compressive deformation Df3 of the golf ball is not less than 3.07 mm and not greater than 3.75 mm,
• a difference (Df1−Df2) between the amount of compressive deformation Df1 and the amount of compressive deformation Df2 is not less than 0.40 mm and not greater than 1.00 mm, and
• a difference (Df2−Df3) between the amount of compressive deformation Df2 and the amount of compressive deformation Df3 is not less than 0.01 mm and not greater than 0.12 mm.