MESON Chess Problem Database

Problem Display
PID: 96442 (7N/4rpB1/1Q1pk3/8/B1P1q3/5RN1/4P1K1/4R3 w - - 0 1)

Holladay, Edgar Dinwiddie

Problemas, 1981

7N/4rpB1/1Q1pk3/8/B1P1q3/5RN1/4P1K1/4R3

#2

10 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qd3
      • 2.exd3#
    • 1...Qxf3+
      • 2.exf3#
    • 1...Qxe2+
      • 2.Rxe2#
    • 1...Qe3
      • 2.Rxe3#
      • 2.Qxe3#
  • Tries
    • 1.Sxe4?
      • threat
        • 2.Sc5#
        • 2.Sg5#
        • 2.Qxd6#
      • 1...Ra7
        • 2.Qxd6#
      • 1...Rb7
        • 2.Qxd6#
      • 1...Rc7
        • 2.Qxd6#
      • 1...Re8
        • 2.Qxd6#
      • 1...f6
        • 2.Qxd6#
      • 1...Rd7!
  • Keys
    • 1.Qe3!
      • threat
        • 2.Qxe4#
      • 1...Qxe3
        • 2.Rxe3#
      • 1...d5
        • 2.Qb6#
      • 1...Qe5
        • 2.Rf6#
      • 1...f5
        • 2.Qh6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • Q(a);N_PINR(D),OGATE::R(A)+P(B),XQ(a)
    • Q(a);CHECK,OGATE,XR(D)::R(A)+P(B),XQ(a)
    • Q(a);CHECK,N_PINR(D),OGATE,P_SPINQ(a),XP(B)::R(A),XQ(a)
  • Tries
    • Try
      • S(E);N_SPINR(D),XQ(a)
      • Threat
        • DUALS(3)
      • Vars
        • R(d);::QAR1(H),XP(b)
        • P(e);::QAR1(H),XP(b)
      • Refutation
        • R(d);
  • Actual
    • Q(H);N_PINP(b),P_PINQ(a)
    • Threat
      • QAR2(H),XQ(a)
    • Vars
      • Q(a);N_PINR(D),N_SPINQ(a),XQ(H)::R(D),XQ(a)
      • P(b);OGATEB::QAR(H)
      • Q(a);N_PINR(D)::R1(D)
      • P(e);N_GUARD::QAR(H)
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