MESON Chess Problem Database

Problem Display
PID: 271824 (2r3b1/3n2Q1/1p1N3p/1P1k1Bp1/2R3P1/8/4N2B/b3K1n1 w - - 0 1)

Ronga, J

Sunday Referee, 1933

(First published on Sun Oct 22 1933)

2r3b1/3n2Q1/1p1N3p/1P1k1Bp1/2R3P1/8/4N2B/b3K1n1

#2

9 + 9

15239 Valois Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Rc5
      • 2.Qxg8#
    • 1...Rc6
      • 2.Qxg8#
    • 1...Rc7
      • 2.Qxg8#
    • 1...Bc3+
      • 2.Sxc3#
    • 1...Bd4
      • 2.Qxd4#
    • 1...Be6
      • 2.Be4#
    • 1...Bf7
      • 2.Qxf7#
    • 1...Bh7
      • 2.Qf7#
  • Tries
    • 1.Rd4+?
      • 1...Bxd4
        • 2.Qxd4#
      • 1...Kc5!
    • 1.Qxd7?
      • threat
        • 2.Be4#
      • 1...Bc3+
        • 2.Sxc3#
      • 1...Rxc4
        • 2.Se4#
        • 2.Sb7#
      • 1...Re8
        • 2.Qc6#
        • 2.Qb7#
      • 1...Bh7
        • 2.Be6#
        • 2.Qe6#
        • 2.Qf7#
      • 1...Sf3+!
  • Keys
    • 1.Qc3!
      • threat
        • 2.Rd4#
      • 1...Bxc3+
        • 2.Sxc3#
      • 1...Sf3+
        • 2.Qxf3#
      • 1...Rxc4
        • 2.Qxc4#
      • 1...Sxe2
        • 2.Qf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • R(h);N_GUARD::QAB(I),XB(i)
    • B(a);CHECK,N_GUARD::S(B),XB(a)
    • B(a);N_GUARD::QAR1(I),XB(a)
    • B(i);SBLOCK::B(G)
    • B(i);N_GUARD::QAB(I),XB(i)
    • B(i);N_GUARD::QAB(I)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • B(a);OGATE,XR(D)::QAR1(I),XB(a)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(I);XS(g)
      • Threat
        • B(G)
      • Vars
        • B(a);CHECK,N_GUARD::S(B),XB(a)
      • Refutation
        • S(b);CHECK
  • Actual
    • Q(I);
    • Threat
      • R1(D)
    • Vars
      • B(a);CHECK,XQ(I)::S(B),XB(a)
      • S(b);CHECK,N_GUARD::QAB(I),XS(b)
      • R(h);OGATE,XR(D)::QAB1(I),XR(h)
      • S(b);N_GUARD,XS(B)::QAB(I)
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