MESON Chess Problem Database

Problem Display
PID: 272065 (4K2B/1p2p3/R1r1k1p1/5p2/2N4N/b2p3P/B3r1Q1/4R3 w - - 0 1)

Hall, A

The Problemist, 1957

4K2B/1p2p3/R1r1k1p1/5p2/2N4N/b2p3P/B3r1Q1/4R3

#2

9 + 9

3713 Snap 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Re3
      • 2.Rxe3#
    • 1...Re5
      • 2.Rxe5#
    • 1...Rd6
      • 2.Sb2#
      • 2.Sd2#
      • 2.Sxa3#
      • 2.Sa5#
      • 2.Sxd6#
    • 1...d2
      • 2.Rxe2#
  • Tries
    • 1.Se3+?
      • 1...Rxa2
        • 2.Qd5#
        • 2.Qxg6#
      • 1...Kd6!
    • 1.Sb6+?
      • 1...Rc4
        • 2.Qd5#
        • 2.Qxg6#
      • 1...Kd6!
    • 1.Sd6+?
      • 1...Rc4
        • 2.Bxc4#
      • 1...Kxd6!
    • 1.Sxg6?
      • threat
        • 2.Sf4#
        • 2.Sf8#
      • 1...Re4
        • 2.Sf4#
      • 1...Bc1
        • 2.Sf8#
      • 1...Bd6
        • 2.Sf8#
      • 1...f4!
    • 1.Rxc6+?
      • 1...Bd6
        • 2.Sb2#
        • 2.Sd2#
        • 2.Sa3#
        • 2.Sa5#
        • 2.Sb6#
        • 2.Sxd6#
      • 1...bxc6!
    • 1.Qxc6+?
      • 1...Bd6
        • 2.Sb2#
        • 2.Sd2#
        • 2.Sa3#
        • 2.Sa5#
        • 2.Sb6#
        • 2.Sxd6#
      • 1...bxc6!
    • 1.Qxe2+?
      • 1...Kd5
        • 2.Qe5#
      • 1...dxe2!
  • Keys
    • 1.Sxf5!
      • threat
        • 2.Sd4#
      • 1...Kxf5
        • 2.Qg4#
      • 1...gxf5
        • 2.Qg8#
      • 1...Re4
        • 2.Qxe4#
      • 1...Bb2
        • 2.Sce3#
      • 1...Bc5
        • 2.Scd6#

Anticipated by 263844(1941)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • R(a);OGATE::R(A),XR(a)
    • R(a);OGATE::R1(A),XR(a)
    • P(c);N_GUARD::R(A),XR(a)
  • Tries
    • Try
      • S(E);CHECK,N_PINR(a),P_PINR(e)
      • Refutation
        • K(f);P-FLIGHT
    • Try
      • S(E);CHECK
      • Refutation
        • K(f);N_SPINR(a),P-FLIGHT
    • Try
      • S(E);CHECK
      • Vars
        • R(e);N_GUARD::B(B),XR(e)
      • Refutation
        • K(f);N_SPINR(a),P-FLIGHT,P_SPINR(e),XS(E)
    • Try
      • S(F);XP(g)
      • Threat
        • DUALS(2)
      • Vars
        • R(a);::S(F)
        • B(b);::S(F)
      • Refutation
        • P(d);
    • Try
      • R(G);CHECK,XR(e)
      • Refutation
        • P(h);XR(G)
    • Try
      • Q(C);CHECK,XR(e)
      • Refutation
        • P(h);P_SPINP(h),XQ(C)
    • Try
      • Q(C);CHECK,P_PINR(e),XR(a)
      • Vars
        • K(f);N_SPINR(e),S_FLIGHT::QAR1(C)
      • Refutation
        • P(c);P_SPINP(c),XQ(C)
  • Actual
    • S(F);XP(d)
    • Threat
      • S(F)
    • Vars
      • K(f);N_SPINR(a),OGATEB,S_FLIGHT,XS(F)::QAB1(C)
      • P(g);OGATE,SBLOCK,XS(F)::QAB(C)
      • R(a);N_GUARD::QAR2(C),XR(a)
      • B(b);::B(B)+S(E)
      • B(b);S_CUTR(e)::B(B)+S(E)
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