MESON Chess Problem Database

Problem Display
PID: 164107 (8/8/8/8/4Q1n1/8/3kNb2/1KR3n1 w - - 0 1)

Coello Alonso, Jose Antonio

Best Problems, 2015

8/8/8/8/4Q1n1/8/3kNb2/1KR3n1

#2

4 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Be3
      • 2.Qc2#
  • Tries
    • 1.Sxg1?
      • threat
        • 2.Sf3#
        • 2.Qe2#
      • 1...Be3
        • 2.Qc2#
      • 1...Sh2
        • 2.Qe2#
      • 1...Se3
        • 2.Qd4#
      • 1...Se5
        • 2.Qe2#
      • 1...Bxg1!
    • 1.Rc2+?
      • 1...Kd1
        • 2.Sc3#
      • 1...Ke1!
  • Keys
    • 1.Sc3!
      • threat
        • 2.Rc2#
      • 1...Be3
        • 2.Qc2#
      • 1...Se2
        • 2.Qxe2#
      • 1...Se3
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • B(c);SBLOCK::QAR1(D)
  • Tries
    • Try
      • S(C);XS(a)
      • Threat
        • DUALS(2)
      • Vars
        • B(c);SBLOCK::QAR1(D)
        • S(d);::QAR1(D)
        • S(d);S_CUTB(c)::QAR2(D)
      • Refutation
        • B(c);XS(C)
    • Try
      • R(B);CHECK
      • Vars
        • K(b);P-FLIGHT::S(C)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • S(C);
    • Threat
      • R1(B)
    • Vars
      • B(c);SBLOCK::QAR1(D)
      • S(a);N_GUARD::QAR1(D),XS(a)
      • S(d);S_CUTB(c)::QAR2(D)
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