MESON Chess Problem Database

Problem Display
PID: 234374 (KB6/8/N1p3pQ/3pnp2/4k3/1Pr5/2r1PP2/1B3N1b w - - 0 1)

Ellerman, Arnoldo

Problemas, 1950

KB6/8/N1p3pQ/3pnp2/4k3/1Pr5/2r1PP2/1B3N1b

#2

9 + 9

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Re3
      • 2.Qxe3#
    • 1...Rc4
      • 2.Qe3#
    • 1...Rc5
      • 2.Qe3#
    • 1...Sd3
      • 2.Qe3#
    • 1...Sf3
      • 2.Qf4#
    • 1...Sc4
      • 2.Qf4#
    • 1...Sg4
      • 2.Qf4#
    • 1...Sd7
      • 2.Qf4#
    • 1...Sf7
      • 2.Qf4#
  • Tries
    • 1.Sc5+?
      • 1...Rxc5
        • 2.Qe3#
      • 1...Kd4!
    • 1.Bxc2+?
      • 1...Rxc2
        • 2.Qe3#
      • 1...Rd3
        • 2.Qe3#
      • 1...Sd3
        • 2.Qe3#
        • 2.Qf4#
      • 1...Kd4!
    • 1.Qg7?
      • threat
        • 2.Qxe5#
      • 1...Kd4
        • 2.Qxe5#
      • 1...Sd3
        • 2.Sg3#
      • 1...Sf3
        • 2.Sg3#
      • 1...Sc4
        • 2.Sc5#
      • 1...Sg4
        • 2.Sd2#
      • 1...Sd7
        • 2.Sd2#
      • 1...Sf7
        • 2.Sd2#
      • 1...Kf4!
  • Keys
    • 1.Qh8!
      • threat
        • 2.Qxe5#
      • 1...Kd4
        • 2.Qxe5#
      • 1...Kf4
        • 2.Qh4#
      • 1...Sd3
        • 2.Sg3#
      • 1...Sf3
        • 2.Sg3#
      • 1...Sc4
        • 2.Sc5#
      • 1...Sg4
        • 2.Sd2#
      • 1...Sd7
        • 2.Sd2#
      • 1...Sf7
        • 2.Sd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 6
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • R(c);N_GUARD::QAR1(G),XR(c)
    • R(c);N_GUARD::QAR1(G)
    • S(f);N_SPINR(b),S_CUTR(c)::QAR1(G)
    • S(f);::QAR1(G)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • R(c);XS(F)::QAR1(G)
      • Refutation
        • K(d);N_SPINR(b),P-FLIGHT
    • Try
      • B(A);CHECK,XR(b)
      • Vars
        • R(c);XB(A)::QAR1(G)
        • R(c);P_SPINR(c)::QAR1(G)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • Q(G);
      • Threat
        • QAR1(G),XS(f)
      • Vars
        • K(d);N_SPINR(b),P-FLIGHT,P_SPINS(f)::QAB1(G),XS(f)
        • S(f);N_SPINR(b),S_CUTR(c)::S(B)
        • S(f);S_CUTR(c)::S(B)
        • S(f);S_CUTR(c)::S(F)
        • S(f);::S(B)
      • Refutation
        • K(d);N_SPINR(b),P-FLIGHT,P_SPINS(f)
  • Actual
    • Q(G);
    • Threat
      • QAR1(G),XS(f)
    • Vars
      • K(d);N_SPINR(b),P-FLIGHT,P_SPINS(f)::QAB1(G),XS(f)
      • K(d);N_SPINR(b),P-FLIGHT,P_SPINS(f)::QAR2(G)
      • S(f);N_SPINR(b),S_CUTR(c)::S(B)
      • S(f);S_CUTR(c)::S(B)
      • S(f);S_CUTR(c)::S(F)
      • S(f);::S(B)
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