MESON Chess Problem Database

Problem Display
PID: 272085 (4N3/K1R1p2q/3N4/1pBk1p2/6p1/5p1p/4Q1R1/7B w - - 0 1)

Gurr, John

1st Prize, Sunday Referee, 1934

(First published on Sun Apr 15 1934)

4N3/K1R1p2q/3N4/1pBk1p2/6p1/5p1p/4Q1R1/7B

#2

8 + 8

15239 Valois Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...fxe2
      • 2.Rxe2#
    • 1...f2
      • 2.Rg1#
      • 2.Rxf2#
      • 2.Rh2#
      • 2.Rg3#
      • 2.Rxg4#
    • 1...exd6
      • 2.Sf6#
    • 1...e5
      • 2.Qa2#
    • 1...e6
      • 2.Sf6#
  • Tries
    • 1.Bf2?
      • threat
        • 2.Rc5#
      • 1...exd6
        • 2.Sf6#
      • 1...e5
        • 2.Qa2#
      • 1...e6
        • 2.Qxb5#
      • 1...fxe2!
    • 1.Qxf3+?
      • 1...Ke5
        • 2.Re2#
      • 1...Ke6
        • 2.Re2#
      • 1...gxf3!
  • Keys
    • 1.Bg1!
      • threat
        • 2.Rc5#
      • 1...fxe2
        • 2.Rxe2#
      • 1...exd6
        • 2.Sf6#
      • 1...f2
        • 2.Rxg4#
      • 1...e5
        • 2.Qa2#
      • 1...e6
        • 2.Qxb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATE,XQ(B)::B(A)+R(C),XP(a)
    • P(g);N_GUARD,P_PINR(G),XS(E)::S(H)
    • P(g);P_PINR(G),SBLOCK::QAB(B)
    • P(g);N_GUARD,P_PINR(G)::S(H)
  • Tries
    • Try
      • B(D);
      • Threat
        • R1(G)
      • Vars
        • P(g);N_GUARD,P_PINR(G),SBLOCK,XS(E)::S(H)
        • P(g);P_PINR(G),SBLOCK::QAB(B)
        • P(g);P_PINR(G),SBLOCK::QAR2(B),XP(d)
      • Refutation
        • P(a);XQ(B)
    • Try
      • Q(B);CHECK,XP(a)
      • Vars
        • K(e);P-FLIGHT,S_CUTP(c)::R(C)
        • K(e);S_CUTP(c),S_FLIGHT::R(C)
      • Refutation
        • P(c);XQ(B)
  • Actual
    • B(D);
    • Threat
      • R1(G)
    • Vars
      • P(a);OGATE,XQ(B)::B(A)+R(C),XP(a)
      • P(g);N_GUARD,P_PINR(G),SBLOCK,XS(E)::S(H)
      • P(a);OGATEB::B(A)+R(C),XP(c)
      • P(g);P_PINR(G),SBLOCK::QAB(B)
      • P(g);P_PINR(G),SBLOCK::QAR2(B),XP(d)
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