MESON Chess Problem Database

Problem Display
PID: 274424 (Q7/8/2pp4/3k2K1/3pRB2/1P6/2P5/8 w - - 0 1)

Arhoul, MJB

diagrammes, 1979

Q7/8/2pp4/3k2K1/3pRB2/1P6/2P5/8

#2

6 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Kc5
      • 2.Qa5#
  • Tries
    • 1.Kf5?
      • 1...Kc5
        • 2.Qa5#
      • 1...d3!
    • 1.Re1?
      • 1...Kc5
        • 2.Qa5#
      • 1...d3!
    • 1.Re2?
      • 1...Kc5
        • 2.Qa5#
      • 1...d3!
    • 1.Re7?
      • 1...Kc5
        • 2.Qa5#
      • 1...d3!
    • 1.Re8?
      • 1...Kc5
        • 2.Qa5#
      • 1...d3!
    • 1.Qa4?
      • threat
        • 2.Qxd4#
      • 1...Kc5
        • 2.Qa5#
      • 1...d3
        • 2.Qc4#
        • 2.Qd4#
      • 1...c5
        • 2.Qa8#
      • 1...Kxe4!
    • 1.Qa5+?
      • 1...c5
        • 2.Qa8#
      • 1...Kxe4!
    • 1.Qa6?
      • 1...Kc5
        • 2.Qa5#
      • 1...d3
        • 2.Qc4#
      • 1...c5
        • 2.Qb7#
        • 2.Qa8#
      • 1...Kxe4!
    • 1.Qa7?
      • threat
        • 2.Qxd4#
      • 1...c5
        • 2.Qb7#
        • 2.Qa8#
      • 1...d3
        • 2.Qd4#
      • 1...Kxe4!
    • 1.Qh8?
      • threat
        • 2.Qxd4#
      • 1...Kxe4
        • 2.Qh1#
      • 1...d3
        • 2.Qd4#
      • 1...c5
        • 2.Qa8#
      • 1...Kc5!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Qxd4#
      • 1...Kxe4
        • 2.Qh1#
      • 1...Kc5
        • 2.Qa5#
      • 1...d3
        • 2.Qd4#
      • 1...c5
        • 2.Qa8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(b);N_GUARD,N_SPINP(c),P-FLIGHT,S_CUTP(c)::QAR2(F)
  • Tries
    • Try
      • K(E);P-FLIGHT
      • Vars
        • K(b);N_SPINP(c),P-FLIGHT,S_CUTP(c)::QAR2(F)
      • Refutation
        • P(a);
    • Try
      • R(C);
      • Vars
        • K(b);N_SPINP(c),P-FLIGHT,S_CUTP(c)::QAR2(F)
      • Refutation
        • P(a);
    • Try
      • R(C);
      • Vars
        • K(b);N_SPINP(c),P-FLIGHT,S_CUTP(c)::QAR2(F)
      • Refutation
        • P(a);
    • Try
      • R(C);
      • Vars
        • K(b);N_SPINP(c),P-FLIGHT,S_CUTP(c)::QAR2(F)
      • Refutation
        • P(a);
    • Try
      • R(C);
      • Vars
        • K(b);N_SPINP(c),P-FLIGHT,S_CUTP(c)::QAR2(F)
      • Refutation
        • P(a);
    • Try
      • Q(F);N_PINP(c)
      • Threat
        • QAR1(F),XP(a)
      • Vars
        • K(b);N_GUARD,P-FLIGHT,S_CUTP(c)::QAR2(F)
        • P(c);OGATEB,SBLOCK::QAB(F)
      • Refutation
        • K(b);P_SPINP(a),S_FLIGHT,XR(C)
    • Try
      • Q(F);CHECK,N_PINP(c)
      • Vars
        • P(c);OGATEB,P_SPINP(c),SBLOCK::QAB(F)
      • Refutation
        • K(b);S_FLIGHT,XR(C)
    • Try
      • Q(F);N_PINP(c)
      • Vars
        • K(b);N_GUARD,P-FLIGHT,S_CUTP(c)::QAR2(F)
        • P(a);::QAB1(F)
      • Refutation
        • K(b);S_FLIGHT,XR(C)
    • Try
      • Q(F);N_PINP(c)
      • Threat
        • QAR1(F),XP(a)
      • Vars
        • P(a);::QAR1(F)
      • Refutation
        • K(b);S_FLIGHT,XR(C)
    • Try
      • Q(F);N_PINP(c)
      • Threat
        • QAR1(F),XP(a)
      • Vars
        • K(b);OGATEB,S_FLIGHT,XR(C)::QAB(F)
        • P(a);::QAR1(F)
        • P(c);OGATEB,SBLOCK::QAB(F)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(F);N_PINP(c)
    • Threat
      • QAR1(F),XP(a)
    • Vars
      • K(b);OGATEB,S_FLIGHT,XR(C)::QAB(F)
      • K(b);N_GUARD,P-FLIGHT,S_CUTP(c)::QAR2(F)
      • P(a);::QAR1(F)
      • P(c);OGATEB,SBLOCK::QAB(F)
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