MESON Chess Problem Database

Problem Display
PID: 197833 (8/3K4/4Q3/p2R4/kp6/3N4/8/8 w - - 0 1)

Markkola, Paavo Johannes

Suomen Shakki, 1986

8/3K4/4Q3/p2R4/kp6/3N4/8/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Ka3
      • 2.Rxa5#
  • Tries
    • 1.Sc5+?
      • 1...Kb5
        • 2.Qa6#
      • 1...Ka3!
    • 1.Rd4?
      • 1...Kb5
        • 2.Qc6#
      • 1...Ka3!
    • 1.Rc5?
      • threat
        • 2.Qa2#
      • 1...Ka3
        • 2.Rxa5#
      • 1...b3!
    • 1.Re5?
      • threat
        • 2.Qa2#
      • 1...Ka3
        • 2.Rxa5#
      • 1...b3!
    • 1.Rf5?
      • threat
        • 2.Qa2#
      • 1...Ka3
        • 2.Rxa5#
      • 1...b3!
    • 1.Rg5?
      • threat
        • 2.Qa2#
      • 1...Ka3
        • 2.Rxa5#
      • 1...b3!
    • 1.Rh5?
      • threat
        • 2.Qa2#
      • 1...Ka3
        • 2.Rxa5#
      • 1...b3!
  • Keys
    • 1.Rb5!
      • 1...Ka3
        • 2.Rxa5#
      • 1...Kxb5
        • 2.Qc6#
      • 1...b3
        • 2.Qxb3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::R(B),XP(c)
  • Tries
    • Try
      • S(A);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(B);P_PINP(b)
      • Vars
        • K(a);N_SPINP(b),S_FLIGHT::QAB1(C)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT
    • Try
      • R(B);
      • Threat
        • QAR2(C)
      • Vars
        • K(a);P-FLIGHT::R(B),XP(c)
      • Refutation
        • P(b);
    • Try
      • R(B);
      • Threat
        • QAR2(C)
      • Vars
        • K(a);P-FLIGHT::R(B),XP(c)
      • Refutation
        • P(b);
    • Try
      • R(B);
      • Threat
        • QAR2(C)
      • Vars
        • K(a);P-FLIGHT::R(B),XP(c)
      • Refutation
        • P(b);
    • Try
      • R(B);
      • Threat
        • QAR2(C)
      • Vars
        • K(a);P-FLIGHT::R(B),XP(c)
      • Refutation
        • P(b);
    • Try
      • R(B);
      • Threat
        • QAR2(C)
      • Vars
        • K(a);P-FLIGHT::R(B),XP(c)
      • Refutation
        • P(b);
  • Actual
    • R(B);
    • Vars
      • K(a);P-FLIGHT::R(B),XP(c)
      • K(a);OGATEB,S_FLIGHT,XR(B)::QAB1(C)
      • P(b);::QAB1(C),XP(b)
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