MESON Chess Problem Database

Problem Display
PID: 254461 (2R5/3p4/1p1p4/3k1K2/1r1r1p2/1R2P3/5Q2/8 w - - 0 1)

Kofman, Rafael Moiseevich

Die Schwalbe, 1930

2R5/3p4/1p1p4/3k1K2/1r1r1p2/1R2P3/5Q2/8

#2

5 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Ra4
      • 2.Rb5#
    • 1...Rb5
      • 2.Rxb5#
  • Tries
    • 1.Rd3?
      • threat
        • 2.Qf3#
        • 2.e4#
      • 1...fxe3
        • 2.Qg2#
        • 2.Qf3#
      • 1...f3
        • 2.Qxf3#
        • 2.e4#
      • 1...Rxd3!
    • 1.Qg2+?
      • 1...f3
        • 2.Qg8#
      • 1...Re4!
  • Keys
    • 1.Qa2!
      • threat
        • 2.Qa8#
      • 1...Ra4
        • 2.Rb5#
      • 1...Rbc4
        • 2.Rb5#
      • 1...Rdc4
        • 2.Rd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(a);OGATE::R(B)
    • R(a);OGATE::R(B),XR(a)
  • Tries
    • Try
      • R(B);P_PINR(b)
      • Threat
        • DUALS(2)
      • Refutation
        • R(b);N_SPINR(b),XR(B)
    • Try
      • Q(A);CHECK
      • Vars
        • P(c);P_SPINP(c)::QAB(A)
      • Refutation
        • R(b);P_SPINR(b)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)
    • Vars
      • R(a);OGATE::QAB(A)+R(B),DCHECK
      • R(a);OGATE::R(B)
      • R(b);S_CUTR(a),S_CUTR(a)::R(B)
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