MESON Chess Problem Database

Problem Display
PID: 150697 (2K2bN1/6Q1/5r2/1P2k3/3NP3/3P3n/B1P1P2P/B4r2 w - - 0 1)

Ahlheim, Karl-Heinz

Die Schwalbe, 1983

2K2bN1/6Q1/5r2/1P2k3/3NP3/3P3n/B1P1P2P/B4r2

#2

12 + 5

15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Kf4
      • 2.Qg3#
    • 1...Kd6
      • 2.Qc7#
    • 1...Rxa1
      • 2.Qxf6#
    • 1...Rb1
      • 2.Qxf6#
    • 1...Rc1
      • 2.Qxf6#
    • 1...Rd1
      • 2.Qxf6#
    • 1...Re1
      • 2.Qxf6#
    • 1...Rg1
      • 2.Qxf6#
    • 1...Rh1
      • 2.Qxf6#
    • 1...Rf4
      • 2.Sf5#
    • 1...Sf2
      • 2.Qxf6#
    • 1...Sf4
      • 2.Qxf6#
  • Tries
    • 1.Sf3+?
      • 1...Kd6
        • 2.Qc7#
      • 1...Kf4!
    • 1.Sf5+?
      • 1...Kf4
        • 2.Qg3#
      • 1...Rxa1!
    • 1.Sc6+?
      • 1...Kf4
        • 2.Qg3#
      • 1...Kd6!
    • 1.Se6+?
      • 1...Kd6
        • 2.Qc7#
        • 2.Qd7#
        • 2.e5#
      • 1...Rxa1!
  • Keys
    • 1.Sb3+!
      • 1...Kf4
        • 2.Qg3#
      • 1...Kd6
        • 2.Qd7#
      • 1...Ke6
        • 2.Qd7#
      • 1...Rxa1
        • 2.Qxf6#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 9
  • Sets
    • K(c);N_SPINR(d),S_FLIGHT::QAB1(J)
    • R(a);N_GUARD,XB(A)::QAB1(J),XR(d)
    • R(a);N_GUARD::QAB1(J),XR(d)
    • R(a);N_GUARD,P_PINP(C)::QAB1(J),XR(d)
    • R(a);N_GUARD,SBLOCK::B(A)+S(G)
    • S(b);S_CUTR(a)::QAB1(J),XR(d)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • K(c);N_SPINR(d),S_FLIGHT::QAB1(J)
      • Refutation
        • K(c);N_SPINR(d),S_FLIGHT
    • Try
      • S(G);CHECK
      • Vars
        • K(c);N_SPINR(d),S_FLIGHT::QAB1(J)
      • Refutation
        • R(a);XB(A)
    • Try
      • S(G);CHECK
      • Vars
        • K(c);N_SPINR(d),S_FLIGHT::QAB1(J)
      • Refutation
        • K(c);N_SPINR(d),S_FLIGHT
    • Try
      • S(G);CHECK
      • Refutation
        • R(a);XB(A)
  • Actual
    • S(G);CHECK
    • Vars
      • K(c);N_SPINR(d),S_FLIGHT::QAB1(J)
      • K(c);N_SPINR(d),S_FLIGHT::QAR1(J)
      • K(c);N_SPINR(d),P-FLIGHT::QAB1(J)
      • R(a);XB(A)::QAB1(J),XR(d)
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