MESON Chess Problem Database

Problem Display
PID: 139342 (3R4/7B/2pN4/r2Nn2K/1P1kP2R/6Q1/nP5p/6b1 w - - 0 1)

Ellerman, Arnoldo

Enroque!!, 1942

3R4/7B/2pN4/r2Nn2K/1P1kP2R/6Q1/nP5p/6b1

#2

10 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Be3
      • 2.Qxe3#
    • 1...Sc1
      • 2.Qc3#
    • 1...Sc3
      • 2.Qxc3#
      • 2.bxc3#
    • 1...Sxb4
      • 2.Qc3#
    • 1...Sc4
      • 2.Sf5#
  • Tries
    • 1.Qf2+?
      • 1...Kd3
        • 2.Sf4#
      • 1...Bxf2!
  • Keys
    • 1.Sb6!
      • threat
        • 2.Sb5#
        • 2.Sf5#
      • 1...Sf3+
        • 2.Sf5#
      • 1...Sg4+
        • 2.Sb5#
      • 1...Sd7+
        • 2.e5#
      • 1...Sxb4
        • 2.Qc3#
      • 1...Rb5
        • 2.Sxb5#
        • 2.Sf5#
      • 1...Rd5
        • 2.Sf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • B(a);N_GUARD::QAB1(B),XB(a)
    • S(b);N_GUARD::QAB1(B)
    • S(b);N_GUARD,XP(C)::QAB1(B)
    • S(f);P_PINS(F),SBLOCK::S(H)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(d);P-FLIGHT::S(F)
      • Refutation
        • B(a);XQ(B)
  • Actual
    • S(F);
    • Threat
      • DUALS(2)
    • Vars
      • S(f);CHECK::R(J)+S(H),DCHECK
      • S(f);CHECK,OGATE::R(E)+P(D)
      • S(b);N_GUARD,XP(C)::QAB1(B)
      • R(e);::S(H)
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