MESON Chess Problem Database

Problem Display
PID: 275872 (2r5/4p3/1p2qQ2/4R3/1p1kN1N1/8/2p5/3nKB2 w - - 0 1)

van der Burgt, P

Probleemblad, 1953

2r5/4p3/1p2qQ2/4R3/1p1kN1N1/8/2p5/3nKB2

#2

6 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe5
      • 2.Qxe5#
    • 1...Sb2
      • 2.Qf2#
    • 1...Sf2
      • 2.Qxf2#
    • 1...Sc3
      • 2.Qf2#
  • Tries
    • 1.Rd5+?
      • 1...Kxe4
        • 2.Bg2#
        • 2.Rd4#
      • 1...Kxd5!
    • 1.Rxe6+?
      • 1...Kd5
        • 2.Qe5#
      • 1...exf6!
    • 1.Qf2+?
      • 1...Se3
        • 2.Qxe3#
        • 2.Qd2#
      • 1...Sxf2!
  • Keys
    • 1.Sc3!
      • threat
        • 2.Sb5#
      • 1...Qxe5+
        • 2.Qxe5#
      • 1...Kxc3
        • 2.Re3#
      • 1...Rxc3
        • 2.Qf4#
      • 1...Sxc3
        • 2.Qf2#
      • 1...bxc3
        • 2.Qf4#
      • 1...Qd5
        • 2.Rxd5#
      • 1...Qc4
        • 2.Rd5#
      • 1...Qd7
        • 2.Rd5#
      • 1...Qc6
        • 2.Rd5#
      • 1...Rc5
        • 2.Re4#
      • 1...b5
        • 2.Sxb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 2
  • Sets
    • Q(f);OGATE,P_PINS(C),P_SPINQ(f),XR(E)::QAB1(F),XQ(f)
    • S(a);N_GUARD::QAB(F)
    • S(a);N_GUARD::QAB(F),XS(a)
  • Tries
    • Try
      • R(E);CHECK,P_SPINS(C)
      • Refutation
        • K(d);P-FLIGHT,XR(E)
    • Try
      • R(E);CHECK,XQ(f)
      • Vars
        • K(d);P-FLIGHT::QAR1(F)
      • Refutation
        • P(g);XQ(F)
    • Try
      • Q(F);CHECK
      • Refutation
        • S(a);XQ(F)
  • Actual
    • S(C);P_SPINR(E)
    • Threat
      • S(C)
    • Vars
      • Q(f);CHECK,OGATE,P_SPINQ(f),XR(E)::QAB1(F),XQ(f)
      • K(d);N_GUARD,S_FLIGHT,XS(C)::QAB(F)+R(E),DCHECK
      • R(h);SBLOCK,XS(C)::QAR2(F)
      • S(a);N_GUARD,SBLOCK,XS(C)::QAB(F)
      • P(c);SBLOCK,XS(C)::QAR2(F)
      • Q(f);N_PINR(E)::QAB(F)+R(E),DCHECK,XQ(f)
      • Q(f);N_PINR(E)::QAB(F)+R(E),DCHECK
      • R(h);SBLOCK::QAB(F)+R(E),DCHECK
      • P(e);::S(C),XP(e)
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