MESON Chess Problem Database

Problem Display
PID: 234761 (k3r3/3PNb2/1Q6/K7/8/8/8/8 w - - 0 1)

Lincoln, Robert A

Kudesnik, 2015

k3r3/3PNb2/1Q6/K7/8/8/8/8

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rxe7
      • 2.d8Q#
      • 2.d8R#
    • 1...Rb8
      • 2.Qa6#
    • 1...Rc8
      • 2.dxc8Q#
      • 2.dxc8R#
    • 1...Ba2
      • 2.dxe8Q#
      • 2.dxe8R#
    • 1...Bb3
      • 2.dxe8Q#
      • 2.dxe8R#
    • 1...Bc4
      • 2.dxe8Q#
      • 2.dxe8R#
    • 1...Bd5
      • 2.dxe8Q#
      • 2.dxe8R#
    • 1...Bg8
      • 2.dxe8Q#
      • 2.dxe8R#
  • Tries
    • 1.Ka6?
      • threat
        • 2.Qa7#
        • 2.Qb7#
      • 1...Rb8
        • 2.Qa7#
      • 1...Bd5
        • 2.Qa7#
        • 2.dxe8Q#
        • 2.dxe8R#
      • 1...Bc4+!
    • 1.Sc6?
      • threat
        • 2.Qa7#
        • 2.Qa6#
      • 1...Bc4
        • 2.Qa7#
        • 2.dxe8Q#
        • 2.dxe8R#
      • 1...Re5+!
    • 1.Sc8?
      • threat
        • 2.Qa7#
      • 1...Rxc8
        • 2.dxc8Q#
        • 2.dxc8R#
      • 1...Re5+!
  • Keys
    • 1.Sd5!
      • threat
        • 2.Sc7#
      • 1...Bxd5
        • 2.dxe8Q#
        • 2.dxe8R#
      • 1...Re5
        • 2.d8Q#
        • 2.d8R#
      • 1...Rc8
        • 2.dxc8Q#
        • 2.dxc8R#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • R(c);N_GUARD,XS(D)::P=Q
    • R(c);SBLOCK::QAR2(B)
    • R(c);OGATE::PXR(c)=Q
    • B(a);N_GUARD::PXR(c)=Q
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • R(c);::QAR1(B)
      • Refutation
        • B(a);CHECK
    • Try
      • S(D);
      • Threat
        • DUALS(2)
      • Refutation
        • R(c);CHECK
    • Try
      • S(D);
      • Threat
        • QAR1(B)
      • Vars
        • R(c);OGATE,XS(D)::PXR(c)=Q
      • Refutation
        • R(c);CHECK
  • Actual
    • S(D);
    • Threat
      • S(D)
    • Vars
      • B(a);N_GUARD,XS(D)::PXR(c)=Q
      • R(c);N_GUARD,P_PINS(D)::P=Q
      • R(c);OGATE::PXR(c)=Q
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