MESON Chess Problem Database

Problem Display
PID: 184077 (3Q4/7B/Kp1N2r1/4p1p1/2pN2R1/nb2kpB1/2p2R2/2b5 w - - 0 1)

van Gool, Johann Christoffel

The Problemist, 1980

3Q4/7B/Kp1N2r1/4p1p1/2pN2R1/nb2kpB1/2p2R2/2b5

#2

8 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd6
      • 2.Qxg5#
    • 1...Re6
      • 2.Qxg5#
    • 1...Rh6
      • 2.Qxg5#
    • 1...Bd2
      • 2.Rxf3#
  • Tries
    • 1.Sxc2+?
      • 1...Kd3
        • 2.Sb5#
      • 1...Sxc2
        • 2.Sf5#
      • 1...Bxc2!
    • 1.Sc6?
      • threat
        • 2.Sf5#
      • 1...Rxd6
        • 2.Qxg5#
      • 1...Rf6
        • 2.Qxb6#
      • 1...Kd3!
    • 1.Se6?
      • threat
        • 2.Sf5#
      • 1...Rf6
        • 2.Qxb6#
      • 1...Kd3!
    • 1.Sxc4+?
      • 1...Kd3
        • 2.Se2#
        • 2.Sb5#
      • 1...Sxc4
        • 2.Sf5#
      • 1...Bxc4+!
    • 1.S6b5?
      • threat
        • 2.Sf5#
      • 1...Kd3
        • 2.Sxc2#
      • 1...exd4
        • 2.Qxd4#
      • 1...Rd6
        • 2.Qxg5#
      • 1...Rf6!
    • 1.Qa8?
      • threat
        • 2.Qxf3#
        • 2.Qe4#
      • 1...e4
        • 2.Qxe4#
      • 1...Rf6
        • 2.Qe4#
      • 1...Kd3!
  • Keys
    • 1.S4b5!
      • threat
        • 2.Sf5#
      • 1...Kd3
        • 2.Sxc4#
      • 1...Rxd6
        • 2.Qxg5#
      • 1...Rf6
        • 2.Qxb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • R(k);N_GUARD,XS(F)::QAB(H),XP(i)
    • R(k);N_GUARD::QAB(H),XP(i)
    • B(a);SBLOCK::R1(A),XP(f)
  • Tries
    • Try
      • S(C);CHECK,XP(b)
      • Vars
        • K(e);P-FLIGHT,P_SPINR(k)::QAR(H)+S(F)
        • S(c);XS(C)::S(F)
      • Refutation
        • B(d);XS(C)
    • Try
      • S(C);
      • Threat
        • S(F)
      • Vars
        • R(k);N_GUARD,XS(F)::QAB(H),XP(i)
        • R(k);::QAB(H),XP(j)
      • Refutation
        • K(e);P-FLIGHT,P_SPINR(k)
    • Try
      • S(C);
      • Threat
        • S(F)
      • Vars
        • R(k);::QAB(H),XP(j)
      • Refutation
        • K(e);P-FLIGHT,P_SPINR(k)
    • Try
      • S(F);CHECK,XP(g)
      • Vars
        • S(c);XS(F)::S(C)
      • Refutation
        • B(d);CHECK,XS(F)
    • Try
      • S(F);
      • Threat
        • S(C)
      • Vars
        • K(e);P-FLIGHT,P_SPINR(k)::QAR(H)+S(C),XP(b)
        • P(h);OGATE,XS(C)::QAB1(H),XP(h)
        • R(k);N_GUARD::QAB(H),XP(i)
      • Refutation
        • R(k);
    • Try
      • Q(H);
      • Threat
        • DUALS(2)
      • Vars
        • P(h);::QAR1(H),XP(h)
        • R(k);::QAR1(H)
      • Refutation
        • K(e);P-FLIGHT,P_SPINR(k)
  • Actual
    • S(C);
    • Threat
      • S(F)
    • Vars
      • K(e);P-FLIGHT,P_SPINR(k)::QAR(H)+S(F),XP(g)
      • R(k);N_GUARD,XS(F)::QAB(H),XP(i)
      • R(k);::QAB(H),XP(j)
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