MESON Chess Problem Database

Problem Display
PID: 54108 (1K3B2/2NR4/1p2bpN1/3r3r/n2k1b1R/1Q3B2/3P2nq/8 w - - 0 1)

Ellerman, Arnoldo

Chess, 1943

1K3B2/2NR4/1p2bpN1/3r3r/n2k1b1R/1Q3B2/3P2nq/8

#2

9 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Rd6
      • 2.Sxe6#
    • 1...Re5
      • 2.Sb5#
    • 1...Bf5
      • 2.Rxd5#
      • 2.Qxd5#
    • 1...Se3
      • 2.dxe3#
    • 1...Sb2
      • 2.Qc3#
    • 1...Sc3
      • 2.Qxc3#
    • 1...Sc5
      • 2.Qc3#
  • Tries
    • 1.Ka8?
      • threat
        • 2.Sb5#
        • 2.Sxe6#
      • 1...Rxd7
        • 2.Sxe6#
      • 1...Rd6
        • 2.Sxe6#
      • 1...Sc3
        • 2.Qxc3#
      • 1...Qh3
        • 2.Sb5#
      • 1...Re5
        • 2.Sb5#
      • 1...Bh3
        • 2.Sb5#
      • 1...Bg4
        • 2.Sb5#
      • 1...Bf5
        • 2.Sb5#
        • 2.Rxd5#
        • 2.Qxd5#
      • 1...Bf7
        • 2.Sb5#
      • 1...Bg8
        • 2.Sb5#
      • 1...Sc5
        • 2.Sb5#
        • 2.Qc3#
      • 1...b5
        • 2.Sxb5#
        • 2.Sxe6#
      • 1...Bxd7!
    • 1.Kc8?
      • threat
        • 2.Sb5#
        • 2.Sxe6#
      • 1...Rxd7
        • 2.Sxe6#
      • 1...Rd6
        • 2.Sxe6#
      • 1...Sc3
        • 2.Qxc3#
      • 1...Qh3
        • 2.Sb5#
      • 1...Re5
        • 2.Sb5#
      • 1...Bh3
        • 2.Sb5#
      • 1...Bg4
        • 2.Sb5#
      • 1...Bf5
        • 2.Sb5#
        • 2.Qxd5#
      • 1...Bf7
        • 2.Sb5#
      • 1...Bg8
        • 2.Sb5#
      • 1...Sc5
        • 2.Sb5#
        • 2.Qc3#
      • 1...b5
        • 2.Sxb5#
        • 2.Sxe6#
      • 1...Bxd7+!
    • 1.Rxf4+?
      • 1...Sxf4
        • 2.Sb5#
      • 1...Qxf4!
  • Keys
    • 1.Qc2!
      • threat
        • 2.Qe4#
      • 1...Sc3
        • 2.Qxc3#
      • 1...Rd6
        • 2.Sxe6#
      • 1...Re5
        • 2.Sb5#
      • 1...Bf5
        • 2.Rxd5#
      • 1...Sc5
        • 2.Qc3#
      • 1...f5
        • 2.Bg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • R(f);N_PINS(F)::S(F),XB(i)
    • R(g);N_PINS(F)::S(F)
    • S(a);OGATE::P(A),XS(a)
    • S(c);N_GUARD::QAB1(B)
    • S(c);N_GUARD::QAB1(B),XS(c)
  • Tries
    • Try
      • K(H);N_SPINS(F),P-FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • R(f);N_SPINR(f),XR(G)::S(F),XB(i)
        • R(f);::S(F),XB(i)
        • S(c);N_GUARD::QAB1(B),XS(c)
        • Q(b);::S(F)
        • R(g);::S(F)
        • B(i);::S(F)
        • B(i);N_SPINB(e)::S(F)
      • Refutation
        • B(i);N_SPINR(f),XR(G)
    • Try
      • K(H);N_SPINS(F),P-FLIGHT,P_SPINR(G)
      • Threat
        • DUALS(2)
      • Vars
        • R(f);N_SPINR(f),XR(G)::S(F),XB(i)
        • R(f);::S(F),XB(i)
        • S(c);N_GUARD::QAB1(B),XS(c)
        • Q(b);::S(F)
        • R(g);::S(F)
        • B(i);::S(F)
        • B(i);N_SPINB(e)::S(F)
        • B(i);N_PINR(G)::S(F)
      • Refutation
        • B(i);CHECK,N_SPINR(f),XR(G)
    • Try
      • R(D);CHECK,N_SPINS(F),XB(e)
      • Vars
        • S(a);XR(D)::S(F)
      • Refutation
        • Q(b);P_PINS(F),XR(D)
  • Actual
    • Q(B);
    • Threat
      • QAR1(B)
    • Vars
      • S(c);N_GUARD::QAB1(B),XS(c)
      • R(f);N_PINS(F)::S(F),XB(i)
      • R(g);N_PINS(F)::S(F)
      • B(i);N_GUARD,S_CUTR(g)::R1(G),XR(f)
      • S(c);N_GUARD::QAB1(B)
      • P(j);OGATEB::B(I)
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