MESON Chess Problem Database

Problem Display
PID: 52749 (1QR1N1B1/K5P1/N4p2/R2n4/p2k1pP1/2bpnP2/P2r1P2/8 w - - 0 1)

Pongrac, Georg

1st HM., Schach-Aktiv, 2004

1QR1N1B1/K5P1/N4p2/R2n4/p2k1pP1/2bpnP2/P2r1P2/8

#2

12 + 9

56 The Problemist 2004
269 Schach-Aktiv 2005

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Rxd5#
    • 1...Sf1
      • 2.Rxd5#
    • 1...Sc2
      • 2.Rxd5#
    • 1...Sg2
      • 2.Rxd5#
    • 1...Sc4
      • 2.Rxd5#
    • 1...Sxg4
      • 2.Rxd5#
    • 1...Sf5
      • 2.Rxd5#
    • 1...Sb4
      • 2.Qxf4#
      • 2.Qb6#
    • 1...Sb6
      • 2.Qxf4#
      • 2.Qxb6#
    • 1...Sc7
      • 2.Qb6#
    • 1...Se7
      • 2.Qxf4#
      • 2.Qb6#
  • Tries
    • 1.Sc5?
      • threat
        • 2.Se6#
      • 1...Kc4
        • 2.Sb3#
      • 1...Sc7!
    • 1.Sac7?
      • threat
        • 2.Sb5#
        • 2.Se6#
      • 1...Ke5
        • 2.Se6#
      • 1...Sxc7
        • 2.Qb6#
      • 1...Rb2
        • 2.Se6#
      • 1...Kc4!
    • 1.Sd6?
      • threat
        • 2.Sb5#
      • 1...Ke5
        • 2.Sf5#
      • 1...Sc7
        • 2.Qb6#
      • 1...Rb2!
    • 1.Rxa4+?
      • 1...Sc4
        • 2.Raxc4#
        • 2.Rcxc4#
      • 1...Sb4
        • 2.Qxf4#
      • 1...Bb4!
    • 1.Rc4+?
      • 1...Sxc4
        • 2.Rxd5#
      • 1...Kxc4!
    • 1.Qb6+?
      • 1...Ke5
        • 2.Qxf6#
      • 1...Sxb6!
    • 1.fxe3+?
      • 1...Sxe3
        • 2.Qxf4#
        • 2.Qb6#
      • 1...fxe3
        • 2.Rxd5#
      • 1...Kxe3!
  • Keys
    • 1.Sec7!
      • threat
        • 2.Sb5#
        • 2.Se6#
      • 1...Kc4
        • 2.Sb5#
      • 1...Ke5
        • 2.Se6#
      • 1...Sxc7
        • 2.Qb6#
      • 1...Rb2
        • 2.Se6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • S(d);N_GUARD::R1(E),XS(h)
    • S(d);N_GUARD,XP(D)::R1(E),XS(h)
    • S(h);N_GUARD::QAB(I)
  • Tries
    • Try
      • S(F);
      • Threat
        • S(F)
      • Vars
        • K(f);P-FLIGHT,P_SPINS(h)::R(J)+S(F)
      • Refutation
        • S(h);
    • Try
      • S(F);
      • Threat
        • DUALS(2)
      • Vars
        • K(f);P_SPINS(h),S_FLIGHT::QAB(I)+S(F)
        • S(h);N_GUARD,XS(F)::QAB(I)
        • R(a);::S(F)
      • Refutation
        • K(f);P-FLIGHT,P_SPINS(h)
    • Try
      • S(K);
      • Threat
        • S(K)
      • Vars
        • K(f);P_SPINS(h),S_FLIGHT::QAB(I)+S(K)
        • S(h);N_GUARD::QAB(I)
      • Refutation
        • R(a);
    • Try
      • R(E);CHECK,XP(e)
      • Vars
        • S(h);P_SPINS(h)::QAR2(I),XP(g)
      • Refutation
        • B(b);P_SPINB(b)
    • Try
      • R(J);CHECK
      • Vars
        • S(d);SBLOCK,XR(J)::R1(E),XS(h)
      • Refutation
        • K(f);P-FLIGHT,P_SPINS(h),XR(J)
    • Try
      • Q(I);CHECK
      • Vars
        • K(f);P_SPINS(h),S_FLIGHT::QAB1(I),XP(i)
      • Refutation
        • S(h);XQ(I)
    • Try
      • P(B);CHECK,XS(d)
      • Vars
        • P(g);SBLOCK,XP(B)::R1(E),XS(h)
      • Refutation
        • K(f);S_FLIGHT,XP(B)
  • Actual
    • S(K);
    • Threat
      • DUALS(2)
    • Vars
      • K(f);P-FLIGHT,P_SPINS(h)::R(J)+S(K)
      • K(f);P_SPINS(h),S_FLIGHT::QAB(I)+S(K)
      • S(h);N_GUARD,XS(K)::QAB(I)
      • R(a);::S(K)
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