MESON Chess Problem Database

Problem Display
PID: 194409 (KBB2N2/pQ1r1p2/4r3/4PkP1/6pP/5qP1/3NR3/1b3Rn1 w - - 0 1)

Boorer, PA

The Observer, 1940

(First published on Sun Jun 16 1940)

KBB2N2/pQ1r1p2/4r3/4PkP1/6pP/5qP1/3NR3/1b3Rn1

#2

12 + 9

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qf4
      • 2.Rxf4#
    • 1...Rxe5
      • 2.Rxe5#
    • 1...Rd3
      • 2.Qe4#
    • 1...Rd5
      • 2.Qxf7#
    • 1...Ba2
      • 2.Qe4#
    • 1...Be4
      • 2.Qxe4#
  • Keys
    • 1.Sc4!
      • threat
        • 2.Se3#
      • 1...Rxe5
        • 2.Sd6#
        • 2.Rxe5#
      • 1...Rxb7
        • 2.Sd6#
      • 1...Rc6
        • 2.Qxb1#
      • 1...Red6
        • 2.Sxd6#
      • 1...Rd3
        • 2.Qe4#
      • 1...Rd5
        • 2.Qxf7#
      • 1...Rdd6
        • 2.Sxd6#
      • 1...Rc7
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • Q(c);N_PINQ(H),OGATE::R1(A),XQ(c)
    • R(f);OGATE,P_SPINR(h),XP(F)::R1(C),XR(f)
    • R(h);P_SPINR(f),S_CUTB(a)::QAB1(H)
    • R(h);N_PINQ(H),P_SPINR(f)::QAR2(H),XP(i)
    • B(a);N_GUARD::QAB1(H)
    • B(a);N_GUARD::QAB1(H),XB(a)
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • R(h);N_GUARD,P_SPINR(f),XQ(H)::S(B)
      • R(f);N_PINQ(H),P_SPINR(h)::QAB(H),XB(a)
      • R(f);N_GUARD,P_SPINR(h)::S(B),XR(f)
      • R(h);P_SPINR(f),S_CUTB(a)::QAB1(H)
      • R(h);N_PINQ(H),P_SPINR(f)::QAR2(H),XP(i)
      • R(h);N_GUARD,P_SPINR(f)::S(B),XR(h)
      • R(h);N_GUARD,P_SPINR(f)::S(B)
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