MESON Chess Problem Database

Problem Display
PID: 3195 (br1n4/BkPpRp2/2R2K2/8/8/3B4/8/8 w - - 0 1)

van Dijk, Nils Gustav Gerard

Source?, 1972

br1n4/BkPpRp2/2R2K2/8/8/3B4/8/8

#2

6 + 6

5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Kc8
      • 2.cxb8Q#
      • 2.cxb8R#
    • 1...dxc6
      • 2.cxb8Q#
      • 2.cxb8R#
      • 2.cxd8Q#
      • 2.cxd8R#
    • 1...d5
      • 2.cxb8S#
      • 2.cxd8S#
      • 2.c8Q#
      • 2.c8R#
    • 1...d6
      • 2.cxb8S#
      • 2.cxd8S#
      • 2.c8Q#
      • 2.c8R#
  • Tries
    • 1.Rb6+?
      • 1...Kxa7
        • 2.cxb8Q#
      • 1...Kc8
        • 2.cxb8Q#
      • 1...Kxc7!
    • 1.cxd8S+?
      • 1...Kxa7
        • 2.Ra6#
      • 1...Rxd8!
    • 1.c8Q+?
      • 1...Kxa7
        • 2.Ra6#
        • 2.Qa6#
      • 1...Rxc8!
  • Keys
    • 1.Rxd7!
      • threat
        • 2.cxb8S#
        • 2.cxd8S#
        • 2.c8Q#
        • 2.c8R#
      • 1...Kxc6
        • 2.cxb8S#
      • 1...Kxa7
        • 2.c8S#
      • 1...Kc8
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...Sxc6
        • 2.cxb8Q#
        • 2.cxb8R#
      • 1...Rc8
        • 2.cxd8S#
      • 1...Se6
        • 2.c8Q#

Anticipated by 22009(1923), 26657(1923), 51544(1963)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::PXR(e)=Q
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • K(a);P-FLIGHT,XB(D)::PXR(e)=Q
        • K(a);S_FLIGHT::PXR(e)=Q
      • Refutation
        • K(a);P-FLIGHT,P_SPINP(b),XP(E)
    • Try
      • P(E);CHECK,P_PINP(b),XS(f)
      • Vars
        • K(a);P-FLIGHT,XB(D)::R1(B)
      • Refutation
        • R(e);XS(E)
    • Try
      • P(E);CHECK,P_PINP(b)
      • Refutation
        • R(e);XQ(E)
  • Actual
    • R(F);XP(b)
    • Threat
      • DUALS(4)
    • Vars
      • K(a);S_FLIGHT,XR(B)::PXR(e)=S
      • K(a);P-FLIGHT,XB(D)::P=S
      • K(a);S_FLIGHT::PXS(f)=Q
      • S(f);SBLOCK,XR(B)::PXR(e)=Q
      • R(e);::PXS(f)=S
      • S(f);::P=Q
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