MESON Chess Problem Database

Problem Display
PID: 230830 (5K2/3B1N2/2P1N3/pRP5/4k3/4n3/4Q1P1/8 w - - 0 1)

Petkov, Petko Andonov

Stella Polaris, 1968

5K2/3B1N2/2P1N3/pRP5/4k3/4n3/4Q1P1/8

#2

9 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Qd3#
  • Tries
    • 1.Kg7?
      • 1...Kd5
        • 2.Qd3#
      • 1...Kf5
        • 2.Qf3#
      • 1...a4!
    • 1.Seg5+?
      • 1...Kf4
        • 2.Qf3#
        • 2.Qf2#
      • 1...Kd5
        • 2.Qd3#
      • 1...Kd4!
    • 1.Sc7?
      • 1...Kf4
        • 2.Qf3#
      • 1...a4
        • 2.Rb4#
      • 1...Kd4!
    • 1.Rb3?
      • threat
        • 2.Qd3#
        • 2.Qf3#
      • 1...Kd5
        • 2.Qd3#
      • 1...Kf5!
    • 1.Rxa5?
      • 1...Kd5
        • 2.Qd3#
      • 1...Kf5!
    • 1.Qc2+?
      • 1...Kd5
        • 2.Qd3#
      • 1...Sxc2!
    • 1.g4?
      • 1...Kd5
        • 2.Qd3#
      • 1...a4!
  • Keys
    • 1.Sf4!
      • 1...Kd4
        • 2.Qd3#
      • 1...Kxf4
        • 2.Qf3#
      • 1...a4
        • 2.Rb4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • K(b);N_SPINS(a),S_FLIGHT::QAR2(A)
  • Tries
    • Try
      • K(I);S_FLIGHT
      • Vars
        • K(b);N_SPINS(a),S_FLIGHT::QAR2(A)
      • Refutation
        • P(c);
    • Try
      • S(F);CHECK
      • Vars
        • K(b);N_SPINS(a),S_FLIGHT::QAR2(A)
      • Refutation
        • K(b);N_SPINS(a),P-FLIGHT
    • Try
      • S(F);
      • Vars
        • K(b);N_SPINS(a),P-FLIGHT::QAR1(A)
        • P(c);N_GUARD::R(C)
      • Refutation
        • K(b);N_SPINS(a),P-FLIGHT
    • Try
      • R(C);
      • Threat
        • DUALS(2)
      • Vars
        • K(b);N_SPINS(a),S_FLIGHT::QAR2(A)
      • Refutation
        • K(b);N_SPINS(a),S_FLIGHT
    • Try
      • R(C);XP(c)
      • Vars
        • K(b);N_SPINS(a),S_FLIGHT::QAR2(A)
      • Refutation
        • K(b);N_SPINS(a),S_FLIGHT
    • Try
      • Q(A);CHECK,N_PINS(a)
      • Vars
        • K(b);S_FLIGHT::QAR2(A)
      • Refutation
        • S(a);XQ(A)
    • Try
      • P(B);
      • Vars
        • K(b);N_SPINS(a),S_FLIGHT::QAR2(A)
      • Refutation
        • P(c);
  • Actual
    • S(F);
    • Vars
      • K(b);N_SPINS(a),P-FLIGHT::QAR1(A)
      • K(b);N_SPINS(a),P-FLIGHT,XS(F)::QAR1(A)
      • P(c);N_GUARD::R(C)
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