MESON Chess Problem Database

Problem Display
PID: 231139 (K7/8/2Q5/3p1N2/4kN2/8/6R1/8 w - - 0 1)

Werle, Allan Theodor

Hvar a Dag, 1927

K7/8/2Q5/3p1N2/4kN2/8/6R1/8

#2

5 + 2

5454 Near Snap 2021
6490 yacpdb 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Sh5?
      • 1...Kd3
        • 2.Qc2#
      • 1...Kf3
        • 2.Qxd5#
      • 1...Kxf5
        • 2.Qxd5#
      • 1...Ke5!
    • 1.Sg6?
      • 1...Kd3
        • 2.Qc2#
      • 1...Kf3
        • 2.Qxd5#
      • 1...Kxf5!
    • 1.Rf2?
      • threat
        • 2.Qxd5#
        • 2.Qe6#
      • 1...Ke5
        • 2.Qe6#
      • 1...Kxf5!
    • 1.Rg4?
      • threat
        • 2.Qxd5#
      • 1...Ke5
        • 2.Qe6#
      • 1...Kxf5
        • 2.Qe6#
      • 1...Kf3!
    • 1.Qe6+?
      • 1...Kf3
        • 2.Qe3#
      • 1...Kxf4!
  • Keys
    • 1.Sd3!
      • 1...Kxd3
        • 2.Qc2#
      • 1...Kf3
        • 2.Qxd5#
      • 1...Kxf5
        • 2.Qg6#

Anticipated by 2576(1871), 4559(1879), 51071(1880), 194195(1917), 195099(1918), 22068(1924), 56805(1925), 205551(1925), 231085(1927)

This anticipates 60792(1929), 58199(1997)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(B);
      • Vars
        • K(a);N_SPINP(b),S_FLIGHT::QAB1(D)
        • K(a);S_FLIGHT::QAB(D),XP(b)
        • K(a);N_SPINP(b),S_FLIGHT,XS(C)::QAR2(D),XP(b)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT
    • Try
      • S(B);
      • Vars
        • K(a);N_SPINP(b),S_FLIGHT::QAB1(D)
        • K(a);S_FLIGHT::QAB(D),XP(b)
      • Refutation
        • K(a);N_SPINP(b),S_FLIGHT,XS(C)
    • Try
      • R(A);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);N_SPINP(b),P-FLIGHT::QAR1(D)
      • Refutation
        • K(a);N_SPINP(b),S_FLIGHT,XS(C)
    • Try
      • R(A);
      • Threat
        • QAB1(D),XP(b)
      • Vars
        • K(a);N_SPINP(b),P-FLIGHT::QAR1(D)
        • K(a);N_SPINP(b),S_FLIGHT,XS(C)::QAB1(D)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(D);CHECK,N_PINP(b)
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(D)
      • Refutation
        • K(a);P-FLIGHT,XS(B)
  • Actual
    • S(B);
    • Vars
      • K(a);N_SPINP(b),OGATEB,S_FLIGHT,XS(B)::QAB1(D)
      • K(a);S_FLIGHT::QAB(D),XP(b)
      • K(a);N_SPINP(b),OGATEB,S_FLIGHT,XS(C)::QAB1(D)
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