MESON Chess Problem Database

Problem Display
PID: 103491 (Q7/8/2PNP3/R1PrP2R/1p1kp3/1K6/5P2/1B6 w - - 0 1)

Bogdanov, Evgeny Mikhailovich

Thema Danicum, 1985

Q7/8/2PNP3/R1PrP2R/1p1kp3/1K6/5P2/1B6

#2

11 + 4

6490 yacpdb 2009
5454 Near Snap 2016

SOLUTION

  • SOUND
  • Tries
    • 1.Qa7?
      • threat
        • 2.Sb5#
      • 1...Rxc5
        • 2.Qxc5#
      • 1...Rxd6
        • 2.cxd6#
      • 1...Rxe5!
    • 1.Qh8?
      • threat
        • 2.Sf5#
      • 1...Rxe5
        • 2.Qxe5#
      • 1...Rxd6
        • 2.exd6#
      • 1...Rxc5!
  • Keys
    • 1.Qd8!
      • 1...Rxc5
        • 2.Sb5#
      • 1...Rxe5
        • 2.Sf5#
      • 1...Rxd6
        • 2.Qxd6#
      • 1...e3
        • 2.Qh4#

This anticipates 7730(1993), 244496(2005)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(K);
      • Threat
        • S(I)
      • Vars
        • R(d);OGATE,P_SPINR(d),XP(E)::QAB1(K),XR(d)
        • R(d);OGATE,XS(I)::QAB(K)+P(E),XR(d)
      • Refutation
        • R(d);XP(F)
    • Try
      • Q(K);
      • Threat
        • S(I)
      • Vars
        • R(d);OGATE,P_SPINR(d),XP(F)::QAB1(K),XR(d)
        • R(d);OGATE,XS(I)::QAB(K)+P(F),XR(d)
      • Refutation
        • R(d);XP(E)
  • Actual
    • Q(K);
    • Vars
      • R(d);SBLOCK,XP(E)::QAR(K)+S(I),DCHECK
      • R(d);SBLOCK,XP(F)::QAR(K)+S(I),DCHECK
      • R(d);OGATE,P_SPINR(d),XS(I)::QAR2(K),XR(d)
      • P(c);OGATEB::QAR(K)
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