MESON Chess Problem Database

Problem Display
PID: 97349 (2R1rB2/4r2R/1Ppkp3/6N1/8/3K2P1/B7/3Q4 w - - 0 1)

Ahlheim, Karl-Heinz

4th HM., Problemas, 1968

2R1rB2/4r2R/1Ppkp3/6N1/8/3K2P1/B7/3Q4

#2

9 + 5

6490 yacpdb 2009
15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...c5
      • 2.Ke4#
    • 1...e5
      • 2.Kc4#
  • Tries
    • 1.Se4+?
      • 1...Ke5
        • 2.Rh5#
        • 2.Qh5#
      • 1...Kd7!
    • 1.Sf7+?
      • 1...Kd7
        • 2.Rc7#
      • 1...Kc5!
    • 1.Qg4?
      • threat
        • 2.Qd4#
      • 1...Ke5
        • 2.Qf4#
      • 1...Kd7
        • 2.Qxe6#
      • 1...c5
        • 2.Qxe6#
      • 1...e5
        • 2.Se4#
      • 1...Kc5!
  • Keys
    • 1.Qa4!
      • threat
        • 2.Qd4#
      • 1...Kc5
        • 2.Rxc6#
      • 1...Ke5
        • 2.Qf4#
      • 1...Kd7
        • 2.Qxc6#
      • 1...c5
        • 2.Sf7#
      • 1...e5
        • 2.Qxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(a);::QAR(A)+K(C)
    • P(c);SBLOCK::QAR(A)+K(C)
  • Tries
    • Try
      • S(E);CHECK
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • S(E);CHECK
      • Vars
        • K(b);N_SPINR(d),P-FLIGHT::R1(H)
      • Refutation
        • K(b);P_SPINP(a),S_FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAR2(A)
      • Vars
        • K(b);N_SPINR(d),S_FLIGHT::QAB1(A)
        • K(b);P-FLIGHT,P_SPINP(c)::QAB1(A),XP(c)
        • P(a);::QAR1(A),XP(c)
        • P(c);SBLOCK::S(E)
      • Refutation
        • K(b);P_SPINP(a),S_FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAR2(A)
    • Vars
      • K(b);P_SPINP(a),S_FLIGHT::R1(H),XP(a)
      • K(b);N_SPINR(d),S_FLIGHT::QAB1(A)
      • K(b);P-FLIGHT,P_SPINP(a)::QAB1(A),XP(a)
      • P(a);::S(E)
      • P(c);SBLOCK::QAR1(A),XP(a)
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