MESON Chess Problem Database

Problem Display
PID: 135361 (6Nn/3R4/6p1/4pkbp/K1Q4P/ppp1pN2/3r3P/1q1B1R2 w - - 0 1)

Laib, Kurt Friedrich

2nd Prize, Denken und Raten, 1932

6Nn/3R4/6p1/4pkbp/K1Q4P/ppp1pN2/3r3P/1q1B1R2

#2

9 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4
      • 2.Sd4#
    • 1...Rd3
      • 2.Sxg5#
    • 1...Rd5
      • 2.Sxg5#
    • 1...Rd6
      • 2.Sxg5#
    • 1...Rxd7
      • 2.Sxg5#
    • 1...Bf6
      • 2.Sxd2#
      • 2.Sh6#
    • 1...Be7
      • 2.Sxd2#
    • 1...Bd8
      • 2.Sxd2#
  • Tries
    • 1.Sh6+?
      • 1...Kf6
        • 2.hxg5#
      • 1...Bxh6!
    • 1.Se7+?
      • 1...Bxe7
        • 2.Sxd2#
      • 1...Kf6!
    • 1.Rf7+?
      • 1...Bf6
        • 2.Sxd2#
        • 2.Sh6#
        • 2.Se7#
        • 2.Rxf6#
      • 1...Sxf7!
    • 1.Qe6+?
      • 1...Ke4
        • 2.Sxg5#
        • 2.Qxe5#
      • 1...Kf4
        • 2.Sxd2#
      • 1...Kxe6!
    • 1.Qe4+?
      • 1...Kxe4
        • 2.Sxg5#
      • 1...Qxe4+
        • 2.Sd4#
      • 1...Ke6!
  • Keys
    • 1.Qc8!
      • threat
        • 2.Rd4#
      • 1...Qe4+
        • 2.Sd4#
      • 1...Rd4+
        • 2.Rxd4#
      • 1...Ke4
        • 2.Sxg5#
      • 1...Kf4
        • 2.Sxd2#
      • 1...Kg4
        • 2.Rd4#
      • 1...Ke6
        • 2.Sxg5#
      • 1...Rxd7
        • 2.Sxg5#
      • 1...Rd5
        • 2.Sxg5#
      • 1...Rd6
        • 2.Sxg5#
      • 1...e4
        • 2.Rf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 3
  • Sets
    • Q(a);P_PINQ(F),SBLOCK::R(B)+S(D),DCHECK
    • R(b);N_GUARD::R(B)+S(D),XB(i)
    • R(b);N_GUARD,XR(H)::R(B)+S(D),XB(i)
    • B(i);N_GUARD::R(B)+S(D),XR(b)
  • Tries
    • Try
      • S(I);CHECK
      • Vars
        • K(h);P-FLIGHT::P(G),XB(i)
      • Refutation
        • B(i);XS(I)
    • Try
      • S(I);CHECK
      • Vars
        • B(i);XS(I)::R(B)+S(D),XR(b)
      • Refutation
        • K(h);P-FLIGHT
    • Try
      • R(H);CHECK
      • Refutation
        • S(l);XR(H)
    • Try
      • Q(F);CHECK
      • Vars
        • K(h);P-FLIGHT::R(B)+S(D),XR(b)
      • Refutation
        • K(h);S_FLIGHT,XQ(F)
    • Try
      • Q(F);CHECK
      • Vars
        • K(h);S_FLIGHT,XQ(F)::S(D),XB(i)
        • Q(a);CHECK,SBLOCK,XQ(F)::R(B)+S(D),DCHECK
      • Refutation
        • K(h);P_SPINP(g),S_FLIGHT
  • Actual
    • Q(F);
    • Threat
      • QAB(F)+R(H)
    • Vars
      • Q(a);CHECK,SBLOCK::R(B)+S(D),DCHECK
      • R(b);CHECK::QAB(F)+R(H),XR(b)
      • K(h);S_FLIGHT::S(D),XB(i)
      • K(h);P-FLIGHT::R(B)+S(D),XR(b)
      • K(h);S_FLIGHT::QAB(F)+R(H),DCHECK
      • R(b);N_GUARD,P_SPINR(b),XR(H)::R(B)+S(D),XB(i)
      • R(b);N_GUARD::R(B)+S(D),XB(i)
      • P(g);SBLOCK::QAB(F)+R(H),DCHECK
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