MESON Chess Problem Database

Problem Display
PID: 261503 (3KR1n1/4p3/Q7/RN1k4/3B1P2/3r1rP1/N7/1B6 w - - 0 1)

Birchmeier, Oskar

Neue Zurcher Zeitung, 1966

3KR1n1/4p3/Q7/RN1k4/3B1P2/3r1rP1/N7/1B6

#2

10 + 5

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kc4
      • 2.Qe6#
    • 1...Ke4
      • 2.Qe6#
    • 1...Rxd4
      • 2.Sa3#
      • 2.Sbc3#
      • 2.Sa7#
      • 2.Sc7#
    • 1...e6
      • 2.Qxe6#
  • Tries
    • 1.Kc7?
      • threat
        • 2.Qc6#
      • 1...Kc4
        • 2.Qe6#
      • 1...Ke4
        • 2.Qe6#
      • 1...Rc3+!
    • 1.Kd7?
      • threat
        • 2.Qc6#
        • 2.Qe6#
      • 1...Kc4
        • 2.Qe6#
      • 1...Ke4
        • 2.Qe6#
      • 1...Rxd4
        • 2.Sa3#
        • 2.Sbc3#
        • 2.Sd6#
        • 2.Sa7#
        • 2.Sc7#
        • 2.Qc6#
      • 1...Rc3
        • 2.Qe6#
      • 1...Rde3
        • 2.Qc6#
      • 1...Rfe3
        • 2.Qc6#
      • 1...e5
        • 2.Qc6#
      • 1...e6
        • 2.Qc6#
        • 2.Qxe6#
      • 1...Sf6+!
    • 1.Sb4+?
      • 1...Ke4
        • 2.Qe6#
        • 2.Qg6#
      • 1...Kc4!
    • 1.Sd6+?
      • 1...Kxd4
        • 2.Qb6#
        • 2.Qa7#
      • 1...Ke6!
    • 1.Be5?
      • threat
        • 2.Sbc3#
      • 1...Kc4+
        • 2.Sd4#
      • 1...Kc5+
        • 2.Sd4#
        • 2.Sd6#
      • 1...Rc3
        • 2.Sbxc3#
        • 2.Sc7#
      • 1...Ke4+!
    • 1.Qd6+?
      • 1...Kc4
        • 2.Qe6#
      • 1...Ke4
        • 2.Sbc3#
        • 2.Qe5#
        • 2.Qe6#
      • 1...exd6!
  • Keys
    • 1.Ba7!
      • threat
        • 2.Sbc3#
      • 1...Kc4+
        • 2.Sd4#
      • 1...Ke4+
        • 2.Sd6#
      • 1...Rc3
        • 2.Sbxc3#
        • 2.Sc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • K(c);N_GUARD,P_PINB(D),S_FLIGHT::QAB(H)
    • K(c);N_GUARD,P_PINB(D),P_SPINP(d),P_SPINR(a),S_FLIGHT::QAR2(H)
    • P(d);::QAB1(H),XP(d)
  • Tries
    • Try
      • K(I);S_FLIGHT
      • Threat
        • QAB1(H)
      • Vars
        • K(c);N_GUARD,S_FLIGHT::QAB(H)
        • K(c);N_GUARD,P_SPINP(d),P_SPINR(a),S_FLIGHT::QAR2(H)
      • Refutation
        • R(a);CHECK
    • Try
      • K(I);P-FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • K(c);P_PINB(D),S_FLIGHT::QAB(H)
        • K(c);P_PINB(D),P_SPINP(d),P_SPINR(a),S_FLIGHT::QAR2(H)
        • R(a);::QAB1(H)
        • R(b);::QAB1(H)
        • P(d);::QAB1(H)
      • Refutation
        • S(e);CHECK
    • Try
      • S(B);CHECK
      • Refutation
        • K(c);P_PINB(D),S_FLIGHT
    • Try
      • S(G);CHECK
      • Refutation
        • K(c);P_SPINP(d),S_FLIGHT
    • Try
      • B(D);
      • Threat
        • R(F)+S(G),DCHECK
      • Vars
        • K(c);CHECK,N_GUARD,S_FLIGHT::QAB(H)+S(G)
      • Refutation
        • K(c);CHECK,P_SPINR(a),S_FLIGHT
    • Try
      • Q(H);CHECK
      • Vars
        • K(c);N_GUARD,S_FLIGHT::QAB(H)
      • Refutation
        • P(d);XQ(H)
  • Actual
    • B(D);
    • Threat
      • R(F)+S(G),DCHECK
    • Vars
      • K(c);CHECK,N_GUARD,S_FLIGHT::QAB(H)+S(G)
      • K(c);CHECK,N_GUARD,P_SPINP(d),P_SPINR(a),S_FLIGHT::S(G)
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