MESON Chess Problem Database

Problem Display
PID: 140760 (K3N2b/ppP5/1qpN2pQ/1R1Pk3/4b3/n1Pnp2p/1B4p1/5r2 w - - 0 1)

Ellerman, Arnoldo

Problemas, 1945

K3N2b/ppP5/1qpN2pQ/1R1Pk3/4b3/n1Pnp2p/1B4p1/5r2

#2

9 + 14

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.cxd4#
    • 1...Bf3
      • 2.Qg5#
    • 1...Sf4
      • 2.Qxh8#
    • 1...Sc5
      • 2.c4#
  • Tries
    • 1.Sc4+?
      • 1...Kf5
        • 2.c8Q#
        • 2.c8B#
      • 1...Sxc4!
    • 1.Sf7+?
      • 1...Kf5
        • 2.Qg5#
        • 2.c8Q#
        • 2.c8B#
      • 1...Rxf7!
    • 1.Qg5+?
      • 1...Rf5
        • 2.Sf7#
      • 1...Bf5!
    • 1.Qxh8+?
      • 1...Rf6
        • 2.Qxf6#
      • 1...Kf4!
  • Keys
    • 1.Qh4!
      • threat
        • 2.Qxe4#
      • 1...Bxd5
        • 2.Qe4#
      • 1...Sc5
        • 2.c4#
      • 1...Qd4
        • 2.cxd4#
      • 1...Rf4
        • 2.Qe7#
      • 1...Bf3
        • 2.Qg5#
      • 1...Bf5
        • 2.Sf7#
      • 1...Sf2
        • 2.Qg3#
      • 1...Sf4
        • 2.Qxh8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • Q(i);OGATE::P(B),XQ(i)
    • B(g);N_GUARD,S_CUTR(a)::QAR2(F)
    • S(d);SBLOCK,S_CUTR(a)::QAB(F),XB(n)
    • S(d);N_GUARD,S_CUTQ(i)::B(A)+P(B)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(h);P-FLIGHT::P=Q
      • Refutation
        • S(c);XS(E)
    • Try
      • S(E);CHECK
      • Refutation
        • R(a);XS(E)
    • Try
      • Q(F);CHECK
      • Vars
        • R(a);P_SPINR(a)::S(E)
      • Refutation
        • B(g);P_SPINB(g)
    • Try
      • Q(F);CHECK,XB(n)
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::QAB1(F),XR(a)
      • Refutation
        • K(h);S_FLIGHT
  • Actual
    • Q(F);
    • Threat
      • QAR1(F),XB(g)
    • Vars
      • B(g);P_SPINB(g),XP(D)::QAR1(F)
      • S(d);N_GUARD,S_CUTQ(i)::B(A)+P(B)
      • Q(i);OGATE::P(B),XQ(i)
      • R(a);SBLOCK::QAR2(F)
      • B(g);N_GUARD,S_CUTR(a)::QAR2(F)
      • B(g);SBLOCK,S_CUTR(a)::S(E)
      • S(d);N_GUARD,S_CUTR(a)::QAB(F)
      • S(d);SBLOCK,S_CUTR(a)::QAB(F),XB(n)
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