MESON Chess Problem Database

Problem Display
PID: 50031 (5K2/2BP2nN/4kN2/8/3r4/8/6Q1/8 w - - 0 1)

Loyd, Sam

American Chronicle, 1868

5K2/2BP2nN/4kN2/8/3r4/8/6Q1/8

#2

6 + 3

5206 Sam Loyd and His Chess Problems 1913
5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Rd1
      • 2.Qe4#
    • 1...Rd2
      • 2.Qe4#
    • 1...Rd3
      • 2.Qe4#
    • 1...Ra4
      • 2.Qd5#
    • 1...Rb4
      • 2.Qd5#
    • 1...Rc4
      • 2.Qd5#
    • 1...Re4
      • 2.Qxe4#
    • 1...Rf4
      • 2.Qd5#
    • 1...Rg4
      • 2.Qd5#
    • 1...Rh4
      • 2.Qd5#
    • 1...Rd5
      • 2.Qxd5#
    • 1...Rd6
      • 2.Qe4#
    • 1...Rxd7
      • 2.Qe4#
    • 1...Sf5
      • 2.Qg8#
  • Tries
    • 1.Qf3?
      • threat
        • 2.Sg5#
      • 1...Rf4
        • 2.Qd5#
      • 1...Rd6
        • 2.Qe4#
      • 1...Rg4
        • 2.Qd5#
        • 2.d8S#
      • 1...Rd5
        • 2.Qxd5#
      • 1...Sf5!
    • 1.Qc6+?
      • 1...Rd6
        • 2.Qe4#
      • 1...Kf5!
    • 1.Qe2+?
      • 1...Re4
        • 2.Qxe4#
      • 1...Kf5!
    • 1.Qg4+?
      • 1...Sf5
        • 2.Qg8#
      • 1...Rxg4!
    • 1.Qg5?
      • threat
        • 2.Qe5#
      • 1...Re4
        • 2.Qd5#
        • 2.d8S#
      • 1...Rd5
        • 2.Qxd5#
      • 1...Sf5
        • 2.Qg8#
      • 1...Rd6!
    • 1.Qg6?
      • threat
        • 2.Sg5#
      • 1...Rd6
        • 2.Qe4#
      • 1...Rg4
        • 2.d8S#
      • 1...Rd5!
    • 1.d8S+?
      • 1...Kf5
        • 2.Qg5#
      • 1...Rxd8+!
  • Keys
    • 1.Bf4!
      • 1...Kf5
        • 2.Qg4#
      • 1...Rxf4
        • 2.Qd5#
      • 1...Rxd7
        • 2.Qe4#
      • 1...Rd1
        • 2.Qe4#
      • 1...Rd2
        • 2.Qe4#
      • 1...Rd3
        • 2.Qe4#
      • 1...Ra4
        • 2.Qd5#
      • 1...Rb4
        • 2.Qd5#
      • 1...Rc4
        • 2.Qd5#
      • 1...Re4
        • 2.Qxe4#
      • 1...Rd5
        • 2.Qxd5#
      • 1...Rd6
        • 2.Qe4#
      • 1...Sf5
        • 2.Qg8#
      • 1...Sh5
        • 2.Qh3#
        • 2.Qg4#
      • 1...Se8
        • 2.Qh3#
        • 2.Qg4#

Anticipated by 2493(1868)

This is a version

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • R(a);N_GUARD::QAR2(A)
    • R(a);N_GUARD::QAB1(A)
    • R(a);N_GUARD::QAR2(A),XR(a)
    • R(a);N_GUARD,P_PINS(B)::QAB1(A)
    • R(a);N_GUARD::QAB1(A),XR(a)
    • R(a);N_GUARD,XP(D)::QAR2(A)
    • S(c);OGATE,SBLOCK::QAB(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • S(E)
      • Vars
        • R(a);N_GUARD,P_PINS(B)::QAB1(A)
        • R(a);N_GUARD::QAR2(A)
        • R(a);N_GUARD::QAB1(A),XR(a)
      • Refutation
        • S(c);
    • Try
      • Q(A);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::QAR2(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::QAR2(A),XR(a)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • S(c);OGATE,P_SPINS(c),SBLOCK::QAB(A)
      • Refutation
        • R(a);XQ(A)
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • R(a);N_GUARD::QAB1(A),XR(a)
        • S(c);OGATE,SBLOCK::QAB(A)
      • Refutation
        • R(a);
    • Try
      • Q(A);
      • Threat
        • S(E)
      • Vars
        • R(a);N_GUARD::QAR2(A)
        • R(a);N_GUARD::P=S
      • Refutation
        • R(a);
    • Try
      • P(D);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR1(A)
      • Refutation
        • R(a);CHECK,XS(D)
  • Actual
    • B(C);
    • Vars
      • K(b);S_FLIGHT::QAB1(A)
      • R(a);N_GUARD,P_PINS(B),XB(C)::QAB1(A)
      • R(a);N_GUARD,XP(D)::QAR2(A)
      • R(a);N_GUARD::QAR2(A)
      • R(a);N_GUARD::QAB1(A)
      • R(a);N_GUARD::QAR2(A),XR(a)
      • R(a);N_GUARD::QAB1(A),XR(a)
      • S(c);OGATE,SBLOCK::QAB(A)
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