MESON Chess Problem Database

Problem Display
PID: 50989 (8/K4p2/8/R7/pkN5/7r/2Q5/8 w - - 0 1)

Smedley, Don A

The Spectator, 1956

8/K4p2/8/R7/pkN5/7r/2Q5/8

#2

4 + 4

5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Rc3
      • 2.Qxa4#
  • Tries
    • 1.Kb6?
      • threat
        • 2.Rxa4#
        • 2.Rb5#
      • 1...Rc3
        • 2.Rxa4#
        • 2.Qxa4#
      • 1...Ra3
        • 2.Rb5#
      • 1...Rb3
        • 2.Rb5#
      • 1...Rh5
        • 2.Rxa4#
      • 1...a3
        • 2.Ra4#
        • 2.Rb5#
      • 1...Rh6+!
    • 1.Sd2?
      • threat
        • 2.Qc5#
      • 1...Ka3
        • 2.Rxa4#
      • 1...Kxa5
        • 2.Qc5#
      • 1...Rc3
        • 2.Qxa4#
      • 1...Rh5!
    • 1.Sa3?
      • threat
        • 2.Rxa4#
      • 1...Kxa3
        • 2.Rxa4#
      • 1...Kxa5
        • 2.Qc5#
      • 1...Rb3
        • 2.Qc5#
      • 1...Rc3
        • 2.Qxa4#
      • 1...Rxa3!
    • 1.Rxa4+?
      • 1...Kb5
        • 2.Sd6#
      • 1...Kc5!
  • Keys
    • 1.Sd6!
      • threat
        • 2.Rxa4#
      • 1...Ka3
        • 2.Rxa4#
      • 1...Kxa5
        • 2.Qc5#
      • 1...Ra3
        • 2.Rb5#
      • 1...Rb3
        • 2.Qc5#
      • 1...Rc3
        • 2.Qxa4#
      • 1...a3
        • 2.Ra4#
        • 2.Rb5#

This anticipates 12254(1977)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(a);SBLOCK::QAR1(A),XP(b)
  • Tries
    • Try
      • K(D);S_FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • R(a);::R1(C)
        • R(a);::R1(C),XP(b)
      • Refutation
        • R(a);CHECK
    • Try
      • S(B);
      • Threat
        • QAB1(A)
      • Vars
        • K(c);P_SPINP(b),S_FLIGHT::R1(C),XP(b)
        • K(c);S_FLIGHT,XR(C)::QAR2(A)
        • R(a);SBLOCK::QAR1(A),XP(b)
      • Refutation
        • R(a);
    • Try
      • S(B);
      • Threat
        • R1(C),XP(b)
      • Vars
        • K(c);P_SPINP(b),S_FLIGHT,XS(B)::R1(C),XP(b)
        • K(c);S_FLIGHT,XR(C)::QAR2(A)
        • R(a);SBLOCK::QAB1(A)
        • R(a);SBLOCK::QAR1(A),XP(b)
      • Refutation
        • R(a);XS(B)
    • Try
      • R(C);CHECK,XP(b)
      • Vars
        • K(c);P-FLIGHT::S(B)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • S(B);
    • Threat
      • R1(C),XP(b)
    • Vars
      • K(c);P_SPINP(b),S_FLIGHT::R1(C),XP(b)
      • K(c);S_FLIGHT,XR(C)::QAR2(A)
      • R(a);SBLOCK::R1(C)
      • R(a);SBLOCK::QAB1(A)
      • R(a);SBLOCK::QAR1(A),XP(b)
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