MESON Chess Problem Database

Problem Display
PID: 7362 (8/8/8/N1Q5/8/8/2Rp1K2/2qk4 w - - 0 1)

Farion, Petro Petrovich

StrateGems, 1999

8/8/8/N1Q5/8/8/2Rp1K2/2qk4

#2

4 + 3

3713 Snap 2001
5454 Near Snap 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Sb3?
      • 1...Qxc2
        • 2.Qh5#
      • 1...Qa3
        • 2.Rxd2#
      • 1...Qa1
        • 2.Rxd2#
      • 1...Qb1
        • 2.Rxd2#
      • 1...Qb2!
    • 1.Qe3?
      • 1...Kxc2
        • 2.Qb3#
      • 1...Qb2
        • 2.Qxd2#
      • 1...Qa3
        • 2.Qxd2#
      • 1...Qa1
        • 2.Qxd2#
      • 1...Qb1
        • 2.Qxd2#
      • 1...Qxc2!
    • 1.Qb4?
      • 1...Kxc2
        • 2.Qb3#
      • 1...Qb2
        • 2.Qxd2#
      • 1...Qa3
        • 2.Qxd2#
      • 1...Qa1
        • 2.Qxd2#
      • 1...Qb1
        • 2.Qxd2#
        • 2.Qxb1#
      • 1...Qxc2!
    • 1.Qc3?
      • 1...Qb2
        • 2.Qxd2#
      • 1...Qa3
        • 2.Rxd2#
        • 2.Qxd2#
      • 1...Qa1
        • 2.Rxd2#
        • 2.Qxd2#
      • 1...Qb1
        • 2.Rxd2#
        • 2.Qxd2#
      • 1...Qxc2!
    • 1.Qg5?
      • 1...Qxc2
        • 2.Qg1#
      • 1...Qb2
        • 2.Qxd2#
      • 1...Qa3
        • 2.Qxd2#
      • 1...Qa1
        • 2.Qxd2#
      • 1...Qb1
        • 2.Qxd2#
      • 1...Kxc2!
  • Keys
    • 1.Qd5!
      • 1...Kxc2
        • 2.Qb3#
      • 1...Qxc2
        • 2.Qh1#
      • 1...Qb2
        • 2.Qxd2#
      • 1...Qa3
        • 2.Qxd2#
      • 1...Qa1
        • 2.Qxd2#
      • 1...Qb1
        • 2.Qxd2#

Anticipated by 119287(1987), 15946(1989)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(C);
      • Vars
        • Q(a);SBLOCK,XR(A)::QAB(D)
        • Q(a);N_GUARD::R1(A),XP(c)
      • Refutation
        • Q(a);
    • Try
      • Q(D);
      • Vars
        • K(b);OGATEB,S_FLIGHT,XR(A)::QAB1(D)
        • Q(a);N_GUARD::QAR1(D),XP(c)
      • Refutation
        • Q(a);XR(A)
    • Try
      • Q(D);
      • Vars
        • K(b);OGATEB,S_FLIGHT,XR(A)::QAB1(D)
        • Q(a);N_GUARD::QAR1(D),XP(c)
      • Refutation
        • Q(a);XR(A)
    • Try
      • Q(D);
      • Vars
        • Q(a);N_GUARD::QAR1(D),XP(c)
      • Refutation
        • Q(a);XR(A)
    • Try
      • Q(D);
      • Vars
        • Q(a);SBLOCK,XR(A)::QAR(D)
        • Q(a);N_GUARD::QAR1(D),XP(c)
      • Refutation
        • K(b);S_FLIGHT,XR(A)
  • Actual
    • Q(D);P_PINP(c)
    • Vars
      • K(b);N_SPINP(c),OGATEB,S_FLIGHT,XR(A)::QAB1(D)
      • Q(a);SBLOCK,XR(A)::QAR(D)
      • Q(a);N_GUARD::QAR1(D),XP(c)
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