MESON Chess Problem Database

Problem Display
PID: 78472 (3RR3/8/8/1K2N2r/pN2k1P1/Q3ppB1/4pn2/1r6 w - - 0 1)

Tan Hien Yan

Comm., The Sun-Herald, 1961

3RR3/8/8/1K2N2r/pN2k1P1/Q3ppB1/4pn2/1r6

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Rxb4+
      • 2.Qxb4#
    • 1...Rh1
      • 2.Sd3#
      • 2.Sc4#
      • 2.Sc6#
      • 2.Sg6#
      • 2.Sf7#
    • 1...Rh2
      • 2.Sd3#
      • 2.Sc4#
      • 2.Sc6#
      • 2.Sg6#
      • 2.Sf7#
    • 1...Rh3
      • 2.Sd3#
      • 2.Sc4#
      • 2.Sc6#
      • 2.Sg6#
      • 2.Sf7#
    • 1...Rh4
      • 2.Sd3#
      • 2.Sc4#
      • 2.Sc6#
      • 2.Sg6#
      • 2.Sf7#
    • 1...Rxe5+
      • 2.Rxe5#
    • 1...Rh6
      • 2.Sg6#
    • 1...Rh7
      • 2.Sf7#
    • 1...Sd1
      • 2.Qd3#
    • 1...Sh1
      • 2.Qd3#
    • 1...Sd3
      • 2.Qxd3#
    • 1...Sh3
      • 2.Qd3#
    • 1...Sxg4
      • 2.Qd3#
  • Tries
    • 1.Qc3?
      • threat
        • 2.Rd4#
        • 2.Qd4#
        • 2.Qc4#
        • 2.Qc6#
      • 1...Rxb4+
        • 2.Qxb4#
      • 1...Rxe5+
        • 2.Rxe5#
        • 2.Qxe5#
      • 1...Sxg4
        • 2.Qc2#
        • 2.Qd3#
      • 1...Rc1
        • 2.Rd4#
        • 2.Qd4#
      • 1...Rh6
        • 2.Sg6#
        • 2.Rd4#
        • 2.Qd4#
        • 2.Qc4#
      • 1...Rd1!
  • Keys
    • 1.Qxa4!
      • threat
        • 2.Qa8#
      • 1...Rxb4+
        • 2.Qxb4#
      • 1...Rxe5+
        • 2.Rxe5#
      • 1...Sxg4
        • 2.Qc2#
      • 1...Ra1
        • 2.Sa2#
      • 1...Rc1
        • 2.Sc2#
      • 1...Rd1
        • 2.Sd3#
      • 1...Rh6
        • 2.Sg6#
      • 1...Rh7
        • 2.Sf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • R(a);CHECK,OGATE,P_PINS(F),XS(C)::QAR(A),XR(a)
    • R(h);CHECK,OGATE,P_SPINR(h),XS(F)::R1(H),XR(h)
    • R(h);::R(H)+S(F)
    • S(c);N_GUARD::QAB1(A)
    • S(c);N_GUARD::QAB1(A),XS(c)
    • S(c);N_GUARD,XP(D)::QAB1(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(4)
      • Vars
        • R(a);CHECK,OGATE,P_PINS(F),XS(C)::QAR(A),XR(a)
      • Refutation
        • R(a);N_PINS(C),P_PINS(F)
  • Actual
    • Q(A);XP(f)
    • Threat
      • QAB(A)
    • Vars
      • R(a);CHECK,OGATE,P_PINS(F),P_SPINR(a),XS(C)::QAR(A),XR(a)
      • R(h);CHECK,OGATE,P_SPINR(h),XS(F)::R1(H),XR(h)
      • S(c);N_GUARD,XP(D)::QAB(A)
      • R(a);N_PINS(C),P_PINS(F)::QAR(A)+S(C)
      • R(h);::R(H)+S(F)
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