MESON Chess Problem Database

Problem Display
PID: 183495 (8/8/B7/3p2b1/1P1kr1N1/1KN5/3Pr1q1/3R1Q2 w - - 0 1)

Castellari, Umberto

Il Due Mosse, 1952

8/8/B7/3p2b1/1P1kr1N1/1KN5/3Pr1q1/3R1Q2

#2

8 + 6

136 Problem Observer 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Re1
      • 2.Sb5#
      • 2.Qd3#
    • 1...Rxd2
      • 2.Sb5#
    • 1...Rf2
      • 2.Sb5#
      • 2.Qd3#
    • 1...R2e3
      • 2.dxe3#
    • 1...R4e3
      • 2.dxe3#
    • 1...Be3
      • 2.dxe3#
  • Tries
    • 1.Qf6+?
      • 1...Re5
        • 2.Qb6#
      • 1...Bxf6!
  • Keys
    • 1.Qf5!
      • threat
        • 2.Qxd5#
      • 1...Rxg4
        • 2.Sb5#
      • 1...R4e3
        • 2.dxe3#
      • 1...Rf4
        • 2.Sb5#
        • 2.Qd3#
      • 1...Re5
        • 2.Sb5#
        • 2.Qd3#
      • 1...Re6
        • 2.Sb5#
        • 2.Qd3#
      • 1...Re7
        • 2.Sb5#
        • 2.Qd3#
      • 1...Re8
        • 2.Sb5#
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • R(a);P_SPINR(a),XP(C)::S(E)
    • R(a);OGATE,P_PINS(E)::R(A)+P(C)DCHECK,XR(a)
    • R(d);OGATE,P_PINS(E)::R(A)+P(C)DCHECK,XR(d)
    • B(f);OGATE::R(A)+P(C)DCHECK,XB(f)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • R(d);P_SPINR(d)::QAB(B)
      • Refutation
        • B(f);XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAR1(B),XP(e)
    • Vars
      • R(d);XS(G)::S(E)
      • R(d);OGATE,P_PINS(E)::R(A)+P(C)DCHECK,XR(d)
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