MESON Chess Problem Database

Problem Display
PID: 83613 (2RR4/1p3r1p/8/3Q4/8/5N2/1r1n1K2/nNbk4 w - - 0 1)

Ellerman, Arnoldo

Western Morning News, 1931

2RR4/1p3r1p/8/3Q4/8/5N2/1r1n1K2/nNbk4

#2

6 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf3+
      • 2.Qxf3#
    • 1...Sc2
      • 2.Sc3#
  • Tries
    • 1.Qe4?
      • threat
        • 2.Sc3#
        • 2.Qe1#
        • 2.Qe2#
      • 1...Rxf3+
        • 2.Qxf3#
      • 1...Rxb1
        • 2.Qe1#
        • 2.Qe2#
      • 1...Rc2
        • 2.Qe1#
        • 2.Qe2#
      • 1...Rb3
        • 2.Qe1#
        • 2.Qe2#
      • 1...Re7
        • 2.Sc3#
      • 1...Sc2
        • 2.Sc3#
        • 2.Qe2#
      • 1...Rc7!
    • 1.Qd3?
      • threat
        • 2.Sc3#
        • 2.Qf1#
        • 2.Qe2#
      • 1...Rxf3+
        • 2.Qxf3#
      • 1...Rxb1
        • 2.Qf1#
        • 2.Qe2#
      • 1...Rc2
        • 2.Qf1#
        • 2.Qe2#
      • 1...Rb3
        • 2.Qf1#
        • 2.Qe2#
      • 1...Rd7
        • 2.Sc3#
        • 2.Qe2#
      • 1...Re7
        • 2.Sc3#
      • 1...Sc2
        • 2.Sc3#
        • 2.Qe2#
      • 1...Rc7!
  • Keys
    • 1.Qh5!
      • threat
        • 2.Qh1#
      • 1...Rxf3+
        • 2.Qxf3#
      • 1...Rc7
        • 2.Se1#
      • 1...Rd7
        • 2.Sfxd2#
      • 1...Re7
        • 2.Se5#
      • 1...Rg7
        • 2.Sg5#
      • 1...Sc2
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(g);CHECK,OGATE,XS(C)::QAB(D),XR(g)
    • S(a);SBLOCK::S(A)
  • Tries
    • Try
      • Q(D);
      • Threat
        • DUALS(3)
      • Vars
        • R(g);CHECK,OGATE,XS(C)::QAB(D),XR(g)
        • R(g);N_PINS(C)::S(A)
      • Refutation
        • R(g);N_PINS(C)
    • Try
      • Q(D);
      • Threat
        • DUALS(3)
      • Vars
        • R(g);CHECK,OGATE,XS(C)::QAB(D),XR(g)
        • R(g);N_PINS(C)::S(A)
      • Refutation
        • R(g);N_PINS(C)
  • Actual
    • Q(D);
    • Threat
      • QAR(D)
    • Vars
      • R(g);CHECK,OGATE,P_SPINR(g),XS(C)::QAB(D),XR(g)
      • R(g);N_PINS(C)::QAB(D)+S(C)
      • R(g);N_PINS(C),N_SPINS(e)::QAB(D)+S(C),XS(e)
      • S(a);SBLOCK::S(A)
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