MESON Chess Problem Database

Problem Display
PID: 2813 (5RK1/pk6/bP2R3/5p2/2N5/1n1p3p/Q5N1/5q1B w - - 0 1)

Wormald, Robert Bownas

Source?, 0000

5RK1/pk6/bP2R3/5p2/2N5/1n1p3p/Q5N1/5q1B

#2

8 + 8

1693 English Chess Problems 1876

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1
      • 2.Se1#
    • 1...Qb1
      • 2.Se1#
    • 1...Qc1
      • 2.Se1#
    • 1...Qe1
      • 2.Sxe1#
    • 1...Qf4
      • 2.Sxf4#
    • 1...Bxc4
      • 2.Qxa7#
    • 1...Bb5
      • 2.Qxa7#
    • 1...Sa1
      • 2.Sa5#
    • 1...Sc1
      • 2.Sa5#
    • 1...Sd2
      • 2.Sa5#
    • 1...Sd4
      • 2.Sa5#
    • 1...Sa5
      • 2.Sxa5#
    • 1...Sc5
      • 2.Sa5#
  • Tries
    • 1.Qa3?
      • threat
        • 2.Qe7#
      • 1...Bxc4
        • 2.Qxa7#
      • 1...Qf4
        • 2.Sxf4#
      • 1...Bb5
        • 2.Qxa7#
      • 1...Sc5
        • 2.Sa5#
      • 1...Qxg2+!
    • 1.Qa4?
      • threat
        • 2.Re7#
        • 2.Qc6#
        • 2.Qd7#
      • 1...Bxc4
        • 2.Qxa7#
      • 1...axb6
        • 2.Re7#
        • 2.Qd7#
      • 1...Qe2
        • 2.Qc6#
        • 2.Qd7#
      • 1...Qe1
        • 2.Sxe1#
        • 2.Qc6#
        • 2.Qd7#
      • 1...Qf3
        • 2.Re7#
        • 2.Qd7#
      • 1...Qf4
        • 2.Sxf4#
        • 2.Qc6#
      • 1...Bb5
        • 2.Qxa7#
      • 1...Sd4
        • 2.Sa5#
        • 2.Re7#
        • 2.Qd7#
      • 1...Sa5
        • 2.Sxa5#
        • 2.Re7#
        • 2.Qd7#
      • 1...Sc5
        • 2.Sa5#
        • 2.Qc6#
      • 1...Qxg2+!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Qg7#
      • 1...Qxa1
        • 2.Se1#
      • 1...Bxc4
        • 2.Qxa7#
      • 1...Sxa1
        • 2.Sa5#
      • 1...Qf4
        • 2.Sxf4#
      • 1...Bb5
        • 2.Qxa7#
      • 1...Sd4
        • 2.Sa5#
      • 1...Sc5
        • 2.Sa5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 6
  • Sets
    • Q(a);N_GUARD::B(A)+S(C)
    • Q(a);N_GUARD::B(A)+S(C),XQ(a)
    • B(f);OGATE,P_PINR(F),XS(D)::QAR1(B),XP(g)
    • B(f);OGATE::QAR1(B),XP(g)
    • S(b);N_GUARD::S(D)
    • S(b);N_GUARD::S(D),XS(b)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAR(B)
      • Vars
        • B(f);OGATE,P_PINR(F),XS(D)::QAR1(B),XP(g)
        • Q(a);N_GUARD::B(A)+S(C),XQ(a)
        • B(f);OGATE::QAR1(B),XP(g)
        • S(b);N_GUARD::S(D)
      • Refutation
        • Q(a);CHECK,P_SPINQ(a),XS(C)
    • Try
      • Q(B);
      • Threat
        • DUALS(3)
      • Vars
        • B(f);OGATE,P_PINR(F),XS(D)::QAR1(B),XP(g)
        • B(f);OGATE::QAR1(B),XP(g)
      • Refutation
        • Q(a);CHECK,P_SPINQ(a),XS(C)
  • Actual
    • Q(B);
    • Threat
      • QAR(B)
    • Vars
      • Q(a);N_GUARD,XQ(B)::B(A)+S(C)
      • B(f);OGATE,P_PINR(F),XS(D)::QAR1(B),XP(g)
      • S(b);N_GUARD,XQ(B)::S(D)
      • Q(a);N_GUARD::B(A)+S(C),XQ(a)
      • B(f);OGATE::QAR1(B),XP(g)
      • S(b);N_GUARD::S(D)
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